diff --git a/config/printer-creality-cr10-smart-cr-fdm-v2.5.s1.cfg b/config/printer-creality-cr10-smart-cr-fdm-v2.5.s1.cfg
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index 000000000..ad59402a7
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+++ b/config/printer-creality-cr10-smart-cr-fdm-v2.5.s1.cfg
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+# This file contains pin mappings for the Creality CR-10 Smart
+# with a CR-FDM-v2.5.S1 -100 mainboard (STM32F103RET6).
+#
+# NOTE: This configuration was created because the existing CR-10 Smart
+# examples in config/printer-creality-cr10-smart-*.cfg did not work with
+# this specific CR-FDM-v2.5.S1 mainboard variant. This config is based on
+# reverse-engineered pin analysis and confirmed working configuration.
+#
+# Hardware architecture:
+# - Main board: STM32F103RET6 microcontroller
+# - Secondary strain gauge board: STM32F030F4P6 + NX711 load cell ADC
+#   Connectors: 2x7 pin (14-pin) and 2x8 pin (16-pin) headers to main board
+#   Communicates with main board via I2C/UART for strain gauge data
+# - This configuration uses physical Z endstop instead of strain gauge probe
+#   to ensure reliable operation
+
+# To use this config, during "make menuconfig" select the STM32F103
+# with a "64KiB bootloader" and serial (on USART1 PA10/PA9) communication.
+
+# Flash this firmware by copying "out/klipper.bin" to a SD card and
+# turning the printer on with the card inserted. The firmware filename
+# must end in ".bin" and must not match the last filename that was flashed.
+
+
+# See docs/Config_Reference.md for a description of parameters.
+
+[stepper_x]
+step_pin: PB8
+dir_pin: !PB7
+enable_pin: !PC3
+rotation_distance: 40
+microsteps: 16
+endstop_pin: PC4
+position_min: -5
+position_endstop: -5
+position_max: 305
+homing_speed: 50
+
+[stepper_y]
+step_pin: PB6
+dir_pin: PB5
+enable_pin: !PC3
+rotation_distance: 40
+microsteps: 16
+endstop_pin: PC5
+position_min: -2
+position_endstop: -2
+position_max: 302
+homing_speed: 50
+
+[stepper_z]
+step_pin: PB4
+dir_pin: !PB3
+enable_pin: !PC3
+rotation_distance: 8
+microsteps: 16
+endstop_pin: !PB2
+position_endstop: 0
+position_min: -3
+position_max: 400
+homing_speed: 4
+second_homing_speed: 1
+homing_retract_dist: 2.0
+
+[extruder]
+step_pin: PC2
+dir_pin: PB9
+enable_pin: !PC3
+rotation_distance: 22.0115
+microsteps: 16
+nozzle_diameter: 0.400
+filament_diameter: 1.750
+heater_pin: PB14
+sensor_type: EPCOS 100K B57560G104F
+sensor_pin: PB1
+control: pid
+pid_Kp: 22.865
+pid_Ki: 1.292
+pid_Kd: 101.178
+min_temp: 0
+max_temp: 300
+
+[heater_bed]
+heater_pin: PB13
+sensor_type: EPCOS 100K B57560G104F
+sensor_pin: PB0
+control: pid
+pid_Kp: 72.49
+pid_Ki: 0.844
+pid_Kd: 1542.189
+min_temp: 0
+max_temp: 120
+
+[fan]
+pin: PB15
+kick_start_time: 0.5
+
+[mcu]
+serial: /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
+restart_method: command
+
+[printer]
+kinematics: cartesian
+max_velocity: 500
+max_accel: 4000
+square_corner_velocity: 5.0
+max_z_velocity: 10
+max_z_accel: 1000
+
+# Filament runout sensor
+[filament_switch_sensor runout_sensor]
+pause_on_runout: True
+switch_pin: ^!PA7
+
+# Power control - turn off printer with M81
+[output_pin power]
+pin: PA0
+value: 1
+shutdown_value: 1
+
+# Case lighting
+[output_pin lights]
+pin: PC13
+value: 1
+
+# Board temperature sensor
+[temperature_sensor Board_MCU]
+sensor_type: temperature_mcu
+min_temp: 0
+max_temp: 100
+
+# Enable force moves for calibration
+[force_move]
+enable_force_move: True
+
+# Secondary strain gauge board details:
+# - MCU: STM32F030F4P6 with NX711 load cell ADC chip
+# - Main board interface: 2x7 pin (14-pin) + 2x8 pin (16-pin) connectors
+# - Pin 1 identification: Square pad on PCB, remaining pins are circular
+#
+# CONFIRMED PIN ASSIGNMENTS (STM32F103RET6 main board):
+# Motors: PB3,PB4 (Z), PB5,PB6 (Y), PB7,PB8 (X), PB9,PC2 (E), PC3 (Enable)
+# Endstops: PC4 (X), PC5 (Y), PB2 (Z-physical)
+# Heaters: PB13 (Bed), PB14 (Hotend)
+# Thermistors: PB0 (Bed), PB1 (Hotend)
+# Fans/Outputs: PB15 (Part fan), PC13 (Lights), PA0 (Power)
+# Sensors: PA7 (Filament sensor)
+# Communication: PA9,PA10 (USART1 to host)
+#
+# CONNECTOR 1 - 2x8 (16-pin) - HOTEND & COOLING:
+# Pin 1: HT+, Pin 2: HT+, Pin 3: HT-, Pin 4: TH (Thermistor)
+# Pin 5: Fan/LED VCC, Pin 6: Layer Fan Signal, Pin 7: STM Pin 10, Pin 8: LED Signal
+# Pin 9-10: R11/R10 (TBD), Pin 11: VCC, Pin 12: GND, Pin 13: TH, Pin 14-16: HT-/HT+
+#
+# CONNECTOR 2 - 2x7 (14-pin) - MOTORS & ENDSTOPS:
+# Pin 1-2: Xd/Xb (X Motor), Pin 3-4: Ed/Eb (Extruder), Pin 5-6: X-/FilSensor
+# Pin 7-8: GND, Pin 9: FilRunout, Pin 10: X-, Pin 11-12: Ea/Ec, Pin 13-14: Xa/Xc
+#
+# Probe pins (UNCONFIRMED): PA4 (probe signal?), PA5 (tare control?)
+# WARNING: Pin assignments are speculative based on available pins only
+# Strain gauge probe communication protocol completely unknown
+# PA4/PA5 chosen because they are freed when probe is disabled, but actual
+# probe pins may be different or require secondary board firmware modifications
+# Communication with main board via dedicated pins (not USART1)
+#
+# STM32F103RET6 pins NOT identified in this configuration:
+# Available for future investigation or custom modifications:
+# PA1, PA2, PA3, PA6, PA8, PA11, PA12, PA15
+# PC0, PC1, PC6, PC7, PC8, PC9, PC10, PC11, PC12, PC14, PC15
+# PD0, PD1 (if available on this package)
+#
+# Notes for developers:
+# - PA9/PA10: Reserved for USART1 (host communication)
+# - PA4/PA5: Suspected probe/tare pins (unconfirmed)
+# - Some pins may be connected to secondary board connectors
+# - Verify pin availability before use in custom configurations
+
+# Optional: Probe configuration (commented out for Z endstop operation)
+# EXPERIMENTAL: Strain gauge probe functionality completely unverified
+# Pin assignments below are speculative and likely incorrect
+# No successful probe operation achieved - use physical Z endstop for reliability
+# Before attempting probe, comment out the stepper_z endstop_pin above
+# and uncomment the probe section below (expect failures)
+#[probe]
+#pin: ~PA4  # UNCONFIRMED: May not be correct pin
+#z_offset: -0.75
+#samples: 2
+
+# Optional: Probe tare pin (used with probe configuration above)
+# EXPERIMENTAL: Pin assignment unconfirmed, functionality unknown
+#[output_pin PROBE_TARE_PIN]
+#pin: PA5  # UNCONFIRMED: May not be correct pin
+#value: 0
+
+# Optional: Safe Z homing (used with probe configuration above)
+#[safe_z_home]
+#home_xy_position: 150,150
+#speed: 80
+#z_hop: 3
+#z_hop_speed: 5
+
+# Optional: Bed mesh (used with probe configuration above)
+#[bed_mesh]
+#speed: 120
+#horizontal_move_z: 5
+#mesh_min: 10,10
+#mesh_max: 290,290
+#probe_count: 6,6