Sync from bugfix-2.0.x

config/default/Configuration_adv.h

@@ -1084,6 +1084,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1587,6 +1589,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2773,7 +2777,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2783,13 +2787,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2800,25 +2808,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2867,6 +2875,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2981,9 +2992,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/3DFabXYZ/Migbot/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/ADIMLab/Gantry v1/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/ADIMLab/Gantry v2/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/AlephObjects/TAZ4/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Alfawise/U20-bltouch/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1590,6 +1592,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2776,7 +2780,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2786,13 +2790,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2803,25 +2811,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2870,6 +2878,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2984,9 +2995,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Alfawise/U20/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/AliExpress/UM2pExt/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2776,7 +2780,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2786,13 +2790,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2803,25 +2811,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2870,6 +2878,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2984,9 +2995,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Anet/A2/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Anet/A2plus/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Anet/A6/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   #define SD_DETECT_STATE LOW
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Anet/A8/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   #define SD_DETECT_STATE LOW
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Anet/A8plus/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   #define SD_DETECT_STATE LOW
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Anet/E10/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Anet/E16/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/AnyCubic/Mega Zero/Configuration.h

@@ -1910,6 +1910,8 @@
 // IMPORTANT: The U8glib library is required for Graphical Display!
 //            https://github.com/olikraus/U8glib_Arduino
 //
+// NOTE: If the LCD is unresponsive you may need to reverse the plugs.
+//
 
 //
 // RepRapDiscount FULL GRAPHIC Smart Controller

config/examples/AnyCubic/Mega Zero/Configuration_adv.h

@@ -1540,6 +1540,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2663,7 +2665,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
   #define SPINDLE_LASER_POWERUP_DELAY   5000   // (ms) Delay to allow the spindle/laser to come up to speed/power
   #define SPINDLE_LASER_POWERDOWN_DELAY 5000   // (ms) Delay to allow the spindle to stop
 
@@ -2776,9 +2778,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/AnyCubic/i3/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/ArmEd/Configuration_adv.h

@@ -1089,6 +1089,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1592,6 +1594,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2778,7 +2782,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2788,13 +2792,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2805,25 +2813,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2872,6 +2880,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2986,9 +2997,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Artillery/Genius/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Artillery/Sidewinder X1/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Artillery/Sidewinder X1_0.9_degree_BMG_E3D_V6/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/BIBO/TouchX/cyclops/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/BIBO/TouchX/default/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/BQ/Hephestos/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/BQ/Hephestos_2/Configuration_adv.h

@@ -1093,6 +1093,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE false    // Disable steppers when SD Print is finished
@@ -1595,6 +1597,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2781,7 +2785,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2791,13 +2795,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2808,25 +2816,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2875,6 +2883,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2989,9 +3000,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/BQ/WITBOX/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/BigTreeTech/SKR Mini E3 2.0/Configuration.h

@@ -1915,6 +1915,8 @@
 // IMPORTANT: The U8glib library is required for Graphical Display!
 //            https://github.com/olikraus/U8glib_Arduino
 //
+// NOTE: If the LCD is unresponsive you may need to reverse the plugs.
+//
 
 //
 // RepRapDiscount FULL GRAPHIC Smart Controller

config/examples/BigTreeTech/SKR Mini E3 2.0/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Cartesio/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Copymaster3D/300/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Copymaster3D/400/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Copymaster3D/500/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-10/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2985,9 +2996,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-10S/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-10_5S/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-10mini/CrealityV1/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-10mini/MEEB-3DP/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-20 Pro/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-20/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/CR-8/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-2/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-3 Pro/Configuration_adv.h

@@ -1074,6 +1074,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1580,6 +1582,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2766,7 +2770,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2776,13 +2780,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2793,25 +2801,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2860,6 +2868,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2974,9 +2985,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-3 V2/Configuration_adv.h

@@ -1087,6 +1087,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1590,6 +1592,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2776,7 +2780,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2786,13 +2790,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2803,25 +2811,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2870,6 +2878,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2984,9 +2995,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-3/BigTreeTech SKR Mini E3 1.0/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1590,6 +1592,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2776,7 +2780,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2786,13 +2790,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2803,25 +2811,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2870,6 +2878,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2984,9 +2995,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-3/BigTreeTech SKR Mini E3 1.2/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1590,6 +1592,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2776,7 +2780,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2786,13 +2790,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2803,25 +2811,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2870,6 +2878,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2984,9 +2995,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-3/CrealityV1/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-3/MEEB-3DP/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-4/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-5 Pro/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-5/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Creality/Ender-5_Plus/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Dagoma/Disco Ultimate/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Daycom/3DP-100/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2763,7 +2767,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2773,13 +2777,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2790,25 +2798,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2857,6 +2865,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2971,9 +2982,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/EXP3D/Imprimante multifonction/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Einstart-S/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FYSETC/AIO_II/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FYSETC/Cheetah 1.2/BLTouch/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FYSETC/Cheetah 1.2/base/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FYSETC/Cheetah/BLTouch/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FYSETC/Cheetah/base/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FYSETC/F6_13/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   #define SD_DETECT_STATE LOW
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FYSETC/S6/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Felix/DUAL/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Felix/Single/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FlashForge/Creator 2X/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FlashForge/CreatorPro/Configuration_adv.h

@@ -1084,6 +1084,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1587,6 +1589,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2773,7 +2777,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2783,13 +2787,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2800,25 +2808,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2867,6 +2875,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2981,9 +2992,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FlyingBear/P905H/Configuration_adv.h

@@ -1087,6 +1087,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true          // Disable steppers when SD Print is finished
@@ -1593,6 +1595,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2779,7 +2783,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2789,13 +2793,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2806,25 +2814,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2873,6 +2881,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2987,9 +2998,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/FolgerTech/i3-2020/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Formbot/Raptor/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1590,6 +1592,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2776,7 +2780,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2786,13 +2790,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2803,25 +2811,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2870,6 +2878,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2984,9 +2995,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Formbot/T_Rex_2+/Configuration_adv.h

@@ -1087,6 +1087,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   #define SD_DETECT_STATE (HIGH)
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1590,6 +1592,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2776,7 +2780,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2786,13 +2790,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2803,25 +2811,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2870,6 +2878,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2984,9 +2995,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Formbot/T_Rex_3/Configuration_adv.h

@@ -1090,6 +1090,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1593,6 +1595,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2779,7 +2783,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2789,13 +2793,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2806,25 +2814,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2873,6 +2881,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2987,9 +2998,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A10/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A10D/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A10M/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A10T/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A20/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A20M/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A20T/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/A30/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2773,7 +2777,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2783,13 +2787,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2800,25 +2808,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2867,6 +2875,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2981,9 +2992,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/D200/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/Duplicator5/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/E180/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2773,7 +2777,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2783,13 +2787,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2800,25 +2808,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2867,6 +2875,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2981,9 +2992,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/M201/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/MeCreator2/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1587,6 +1589,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2773,7 +2777,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2783,13 +2787,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2800,25 +2808,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2867,6 +2875,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2981,9 +2992,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/Me_creator/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/Me_ducer/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/PI3A PRO/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/Prusa i3 Pro C/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Geeetech/Prusa i3 Pro W/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/HMS434/Configuration_adv.h

@@ -1076,6 +1076,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1579,6 +1581,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2765,7 +2769,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2775,13 +2779,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2792,25 +2800,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2859,6 +2867,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2973,9 +2984,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Infitary/i3-M508/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Intamsys/FunmatHT_4988/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/JGAurora/A1/Configuration_adv.h

@@ -1090,6 +1090,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1592,6 +1594,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2778,7 +2782,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2788,13 +2792,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2805,25 +2813,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2872,6 +2880,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2986,9 +2997,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/JGAurora/A5/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/JGAurora/A5S/Configuration_adv.h

@@ -1090,6 +1090,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1592,6 +1594,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2778,7 +2782,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2788,13 +2792,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2805,25 +2813,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2872,6 +2880,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2986,9 +2997,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/JGAurora/Magic/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1588,6 +1590,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2774,7 +2778,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2784,13 +2788,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2801,25 +2809,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2868,6 +2876,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2982,9 +2993,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/Kingroon/KP3/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   #define SD_DETECT_STATE LOW
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/MBot/Cube/Configuration_adv.h

@@ -1086,6 +1086,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   #define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true   // Disable steppers when SD Print is finished
@@ -1589,6 +1591,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2775,7 +2779,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2785,13 +2789,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2802,25 +2810,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2869,6 +2877,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2983,9 +2994,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**

config/examples/MakerFarm/Pegasus_12/Configuration_adv.h

@@ -1085,6 +1085,8 @@
   // Enable this option and set to HIGH if your SD cards are incorrectly detected.
   //#define SD_DETECT_STATE HIGH
 
+  //#define SDCARD_READONLY                 // Read-only SD card (to save over 2K of flash)
+
   #define SD_PROCEDURE_DEPTH 1              // Increase if you need more nested M32 calls
 
   #define SD_FINISHED_STEPPERRELEASE true     // Disable steppers when SD Print is finished
@@ -1587,6 +1589,8 @@
 #endif
 
 /**
+ * Probing Margins
+ *
  * Override PROBING_MARGIN for each side of the build plate
  * Useful to get probe points to exact positions on targets or
  * to allow leveling to avoid plate clamps on only specific
@@ -2767,7 +2771,7 @@
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)
   #define SPINDLE_LASER_ACTIVE_HIGH     false  // Set to "true" if the on/off function is active HIGH
   #define SPINDLE_LASER_PWM             true   // Set to "true" if your controller supports setting the speed/power
-  #define SPINDLE_LASER_PWM_INVERT      true   // Set to "true" if the speed/power goes up when you want it to go slower
+  #define SPINDLE_LASER_PWM_INVERT      false  // Set to "true" if the speed/power goes up when you want it to go slower
 
   #define SPINDLE_LASER_FREQUENCY       2500   // (Hz) Spindle/laser frequency (only on supported HALs: AVR and LPC)
 
@@ -2777,13 +2781,17 @@
    *  - PERCENT (S0 - S100)
    *  - RPM     (S0 - S50000)  Best for use with a spindle
    */
-  #define CUTTER_POWER_DISPLAY PWM255
+  #define CUTTER_POWER_UNIT PWM255
 
   /**
-   * Relative mode uses relative range (SPEED_POWER_MIN to SPEED_POWER_MAX) instead of normal range (0 to SPEED_POWER_MAX)
-   * Best use with SuperPID router controller where for example S0 = 5,000 RPM and S255 = 30,000 RPM
+   * Relative Cutter Power
+   * Normally, 'M3 O<power>' sets
+   * OCR power is relative to the range SPEED_POWER_MIN...SPEED_POWER_MAX.
+   * so input powers of 0...255 correspond to SPEED_POWER_MIN...SPEED_POWER_MAX
+   * instead of normal range (0 to SPEED_POWER_MAX).
+   * Best used with (e.g.) SuperPID router controller: S0 = 5,000 RPM and S255 = 30,000 RPM
    */
-  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX] instead of directly
+  //#define CUTTER_POWER_RELATIVE              // Set speed proportional to [SPEED_POWER_MIN...SPEED_POWER_MAX]
 
   #if ENABLED(SPINDLE_FEATURE)
     //#define SPINDLE_CHANGE_DIR               // Enable if your spindle controller can change spindle direction
@@ -2794,25 +2802,25 @@
     #define SPINDLE_LASER_POWERDOWN_DELAY 5000 // (ms) Delay to allow the spindle to stop
 
     /**
-     * M3/M4 uses the following equation to convert speed/power to PWM duty cycle
-     * Power = ((DC / 255 * 100) - SPEED_POWER_INTERCEPT)) * (1 / SPEED_POWER_SLOPE)
-     *   where PWM DC varies from 0 to 255
+     * M3/M4 Power Equation
      *
-     * Set these required parameters for your controller
+     * Each tool uses different value ranges for speed / power control.
+     * These parameters are used to convert between tool power units and PWM.
+     *
+     * Speed/Power = (PWMDC / 255 * 100 - SPEED_POWER_INTERCEPT) / SPEED_POWER_SLOPE
+     * PWMDC = (spdpwr - SPEED_POWER_MIN) / (SPEED_POWER_MAX - SPEED_POWER_MIN) / SPEED_POWER_SLOPE
      */
-    #define SPEED_POWER_SLOPE           118.4  // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN            5000
-    #define SPEED_POWER_MAX           30000    // SuperPID router controller 0 - 30,000 RPM
-    #define SPEED_POWER_STARTUP       25000    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN            5000    // (RPM)
+    #define SPEED_POWER_MAX           30000    // (RPM) SuperPID router controller 0 - 30,000 RPM
+    #define SPEED_POWER_STARTUP       25000    // (RPM) M3/M4 speed/power default (with no arguments)
 
   #else
 
-    #define SPEED_POWER_SLOPE             0.3922 // SPEED_POWER_SLOPE = SPEED_POWER_MAX / 255
-    #define SPEED_POWER_INTERCEPT         0
-    #define SPEED_POWER_MIN               0
-    #define SPEED_POWER_MAX             100    // 0-100%
-    #define SPEED_POWER_STARTUP          80    // The default value for speed power when M3 is called without arguments
+    #define SPEED_POWER_INTERCEPT         0    // (%) 0-100 i.e., Minimum power percentage
+    #define SPEED_POWER_MIN               0    // (%) 0-100
+    #define SPEED_POWER_MAX             100    // (%) 0-100
+    #define SPEED_POWER_STARTUP          80    // (%) M3/M4 speed/power default (with no arguments)
 
     /**
      * Enable inline laser power to be handled in the planner / stepper routines.
@@ -2861,6 +2869,9 @@
         // Turn off the laser on G0 moves with no power parameter.
         // If a power parameter is provided, use that instead.
         //#define LASER_MOVE_G0_OFF
+
+        // Turn off the laser on G28 homing.
+        //#define LASER_MOVE_G28_OFF
       #endif
 
       /**
@@ -2975,9 +2986,21 @@
    * Activate to make volumetric extrusion the default method,
    * with DEFAULT_NOMINAL_FILAMENT_DIA as the default diameter.
    *
-   * M200 D0 to disable, M200 Dn to set a new diameter.
+   * M200 D0 to disable, M200 Dn to set a new diameter (and enable volumetric).
+   * M200 S0/S1 to disable/enable volumetric extrusion.
    */
   //#define VOLUMETRIC_DEFAULT_ON
+
+  //#define VOLUMETRIC_EXTRUDER_LIMIT
+  #if ENABLED(VOLUMETRIC_EXTRUDER_LIMIT)
+    /**
+     * Default volumetric extrusion limit in cubic mm per second (mm^3/sec).
+     * This factory setting applies to all extruders.
+     * Use 'M200 [T<extruder>] L<limit>' to override and 'M502' to reset.
+     * A non-zero value activates Volume-based Extrusion Limiting.
+     */
+    #define DEFAULT_VOLUMETRIC_EXTRUDER_LIMIT 0.00      // (mm^3/sec)
+  #endif
 #endif
 
 /**