G28 - Auto Home
Description
Auto-home one or more axes, moving them towards their endstops until triggered. Each axis is backed off and re-bumped according to the [XYZ]_HOME_BUMP_MM and HOMING_BUMP_DIVISOR settings.
Notes
Homing is required before G29, M48, and some other procedures.
If homing is needed the LCD will blink the X Y Z indicators.
G28 disables bed leveling. Follow with M420 S to turn leveling on, or use RESTORE_LEVELING_AFTER_G28 to automatically keep leveling on after G28.
Parameters
G28
[O]
[R]
[X]
[Y]
[Z]
[O]
|
Optional. If the position is known then exit without homing. (1.1.9) |
[R]
|
Raise before homing distance (1.1.9) |
[X]
|
Flag to go back to the X axis origin |
[Y]
|
Flag to go back to the Y axis origin |
[Z]
|
Flag to go back to the Z axis origin |
Examples
The most-used form of this command is to home all axes:
G28 ; Go to origin on all axesWith no arguments to G28, Marlin homes according to the Z_SAFE_HOMING, QUICK_HOME and HOME_Y_BEFORE_X settings.
G28 X Z ; Home the X and Z axes