#define EXTERNALSERIAL

#define Z_PROBE_Z_OFFSET 0

I tried installing #define EEPROM_MODE 0 before compiling. The printer is still printing. How? I do not understand. Where do the settings come from?

I tried installing #define EEPROM_MODE 0 before compiling. The printer is still printing. How? I do not understand. Where do the settings come from?

#define blower_fan

setup #define ALWAYS_CHECK_ENDSTOPS  = 0, Autolevel enabled; no pause done

#define Z_PROBE_X_OFFSET 64

Yes I have #define ALWAYS_CHECK_ENDSTOPS  = 1.

 #define  _SET_INPUT(IO)  do {DIO ##  IO ## _DDR &= ~MASK(DIO ## IO ## _PIN); } while (0)

sounds more like something triggered z min I guess. Do you have #define ALWAYS_CHECK_ENDSTOPS 1? Try with 0 so z down moves are not disturbed by z min endstop triggering. Just to rule out that part. F

in Configuration.h and HAL.h comment all "#define EXTERNALSERIAL" (3 places in 2 configs):

#define Z_PROBE_X_OFFSET 64

#define VIRTUAL_EXTRUDER 32 // don't change this to more then 16 without modifying the eeprom positions

#define ZHOME_PRE_RAISE 0

#define ORIG_E0_STEP_PIN         26

#define ENDSTOP_Z_BACK_ON_HOME 1

#define MULTI_ZENDSTOP_HOMING 0

#define CONFIGURATION_H

#define DEFAULT_PRINTER_MODE SUPPORT_CNC

#define ALWAYS_CHECK_ENDSTOPS 1