From 0fa3d2642aa6fc329fcb507b5bf32b040c4e201d Mon Sep 17 00:00:00 2001
From: Scott Lahteine <thinkyhead@users.noreply.github.com>
Date: Thu, 13 Mar 2025 17:19:23 -0500
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20MIN=5FPOWER=20(#27742)?=
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Followup to #14746

Co-authored-by: mikeshub <2420379+mikeshub@users.noreply.github.com>
---
 Marlin/Configuration.h               | 1 +
 Marlin/src/inc/Conditionals-1-axes.h | 3 +++
 Marlin/src/module/temperature.h      | 8 ++++----
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 77a9176115..f804dc605a 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -695,6 +695,7 @@
 #define PID_K1     0.95   // Smoothing factor within any PID loop
 
 #if ENABLED(PIDTEMP)
+  //#define MIN_POWER 0
   //#define PID_DEBUG             // Print PID debug data to the serial port. Use 'M303 D' to toggle activation.
   //#define PID_PARAMS_PER_HOTEND // Use separate PID parameters for each extruder (useful for mismatched extruders)
                                   // Set/get with G-code: M301 E[extruder number, 0-2]
diff --git a/Marlin/src/inc/Conditionals-1-axes.h b/Marlin/src/inc/Conditionals-1-axes.h
index 5f8dad37b0..e55f69c797 100644
--- a/Marlin/src/inc/Conditionals-1-axes.h
+++ b/Marlin/src/inc/Conditionals-1-axes.h
@@ -189,6 +189,9 @@
   #ifndef HOTEND_OVERSHOOT
     #define HOTEND_OVERSHOOT 15
   #endif
+  #ifndef MIN_POWER
+    #define MIN_POWER 0
+  #endif
 #else
   #undef MPCTEMP
   #undef PIDTEMP
diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index ffc86eb4e5..27e28f07a8 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -367,13 +367,13 @@ typedef struct { float p, i, d, c, f; } raw_pidcf_t;
 
   typedef
     #if ALL(PID_EXTRUSION_SCALING, PID_FAN_SCALING)
-      PIDCF_t<0, PID_MAX, LPQ_MAX_LEN, PID_FAN_SCALING_MIN_SPEED, PID_FAN_SCALING_LIN_FACTOR>
+      PIDCF_t<MIN_POWER, PID_MAX, LPQ_MAX_LEN, PID_FAN_SCALING_MIN_SPEED, PID_FAN_SCALING_LIN_FACTOR>
     #elif ENABLED(PID_EXTRUSION_SCALING)
-      PIDC_t<0, PID_MAX, LPQ_MAX_LEN>
+      PIDC_t<MIN_POWER, PID_MAX, LPQ_MAX_LEN>
     #elif ENABLED(PID_FAN_SCALING)
-      PIDF_t<0, PID_MAX, PID_FAN_SCALING_MIN_SPEED, PID_FAN_SCALING_LIN_FACTOR>
+      PIDF_t<MIN_POWER, PID_MAX, PID_FAN_SCALING_MIN_SPEED, PID_FAN_SCALING_LIN_FACTOR>
     #else
-      PID_t<0, PID_MAX>
+      PID_t<MIN_POWER, PID_MAX>
     #endif
   hotend_pid_t;