Custom Ender 3 Pro Firmware using Marlin

Please note this is a custom Marlin firewamre (Bugfix 2.1.x) that I made for my printer with parts listed below.

I have also included a precompiled version of the firmware based on Marlin Bugfix 2.1.X. Your milage may vary, install at your own risk.

I had to make edit to the pins_BTT_SKR_MINI_E3_V3_0.h file in order to get the fans and BLTouch probe working as intended. I will outline all my changes below

Printer

• Ender 3 Pro
• Big Tree Tech SKR Mini e3 v3.0 Control Board
• Creality Sprite Extruder Pro
• BLTouch

Congifuration Edits

Configuration.h

• #define BAUDRATE 250000
• #define CUSTOM_MACHINE_NAME "Ender-3 Pro"
• #define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 424.9 }
• #define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN (Enable this)
• #define USE_PROBE_FOR_Z_HOMING (Enable this)
• #define Z_MIN_PROBE_PIN PC14 (Enable this and set for pin of SKR Mini e3)
• #define BLTOUCH (Enable this)
• #define NOZZLE_TO_PROBE_OFFSET { -36.5, -40, 0 }
• #define XY_PROBE_FEEDRATE (10000)
• //#define MIN_SOFTWARE_ENDSTOP_Z
• //#define MAX_SOFTWARE_ENDSTOP_Z
• #define AUTO_BED_LEVELING_BILINEAR (Enable this, disable others)
• #define HOMING_FEEDRATE_MM_M { (4060), (4060), (8*60) }
• #define GRID_MAX_POINTS_X 3
• #define Z_SAFE_HOMING

Configuration_adv.h

• #define CONTROLLER_FAN_PIN FAN2_PIN
• #define CONTROLLER_FAN2_PIN FAN1_PIN
• #define PROBE_OFFSET_WIZARD
• #define FILAMENT_CHANGE_UNLOAD_LENGTH 50
• #define FILAMENT_CHANGE_FAST_LOAD_LENGTH 50
• #define ADVANCED_PAUSE_PURGE_LENGTH 10

pins_BTT_SKR_MINI_E3_V3_0.h

I had to change the Z_STOP_PIN since I don't have a physical Z-Stop anymore. I would run into a weird error where when the printer wanted to home itself X and Y worked, and the Probe on the BLTouch would Extend and Retract a few times before the printer just said STOPPED

• #define Z_STOP_PIN PC14 // Z-STOP

Fan Layout

• Fan under the printer on the SKR Mini - FAN1 (PC7)
• Fan on the Sprite Pro - FAN2 (PB15)
• Parts Cooling Fan - FAN0 (PC6)