Auto_Bed_Leveling: Enhanced G29 command

[Roxy]

Does anyone have any idea why my Y axis moves a small distance during the "Z lift before homing"? Is the firmware trying to ensure that the Z probe is over the bed instead of in the air? This has been offsetting my Y axis by 10-15 mm each time, making it more likely a large print would go off the other side.

It would be helpful for you to post your Configuration.h file. It might have something to do with the Z_SAFE_HOMING stuff:

//If you have enabled the Bed Auto Leveling and are using the same Z Probe for Z Homing,
//it is highly recommended you let this Z_SAFE_HOMING enabled!!!

#define Z_SAFE_HOMING // This feature is meant to avoid Z homing with probe outside the bed area.
// When defined, it will:
// - Allow Z homing only after X and Y homing AND stepper drivers still enabled
// - If stepper drivers timeout, it will need X and Y homing again before Z homing
// - Position the probe in a defined XY point before Z Homing when homing all axis (G28)
// - Block Z homing only when the probe is outside bed area.

#ifdef Z_SAFE_HOMING

#define Z_SAFE_HOMING_X_POINT (X_MAX_LENGTH/2) // X point for Z homing when homing all axis (G28)
#define Z_SAFE_HOMING_Y_POINT (Y_MAX_LENGTH/2) // Y point for Z homing when homing all axis (G28)

#endif