#define SIG_USARTx_RECV   SIG_USART1_RECV

Hello,  My units setting was #define EXT0_WAIT_RETRACT_UNITS 500.  I have set it to zero and will see what happens.

#define EXT0_WAIT_RETRACT_TEMP 150

Not sure if you can handle the high travel acceleration, but could work.#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_Z 500

#define MAX_HALFSTEP_INTERVAL 1999#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_X 500#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_Y 500#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_Z 500#define MAX_TRAV

#define STEPPER_HIGH_DELAY 10

#define STEPPER_HIGH_DELAY 0

#define HAVE_HEATED_BED 0

#define EXT1_EXTRUDER_COOLER_PIN ORIG_FAN_PIN

#define X_ENABLE_ON 0

#define ENDSTOP_X_BACK_ON_HOME 1

I just found that with the #define FAN_BOARD_PIN of 0.92.3, the fan is on when the bed is heating, but also when stepper motors are active. This near what I want for protect my card, even if the venti

Simplest solution currently would be either#define FAN_BOARD_PIN  pinnumber

//#define COMPAT_PRE1

#define PDM_FOR_COOLER 0

#define DEBUG_QUEUE_MOVE

(See Marlin,configuration.adv.h: #define ENDSTOPS_ONLY_FOR_HOMING // If defined the endstops will only be used for homing)

#define FEATURE_Z_PROBE 1

#define EXT0_TEMPSENSOR_TYPE 97

#define DRIVE_SYSTEM 2