flexi-bot/docs/marlin/_gcode/G034-mgc.md

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tag	title	brief	author	requires	since	group	codes	related	notes	parameters	videos	example
g034b	Mechanical Gantry Calibration	Modern replacement for Průša's TMC_Z_CALIBRATION	thisiskeithb	MECHANICAL_GANTRY_CALIBRATION	2.0.4	calibration	G34	M422 M906 M907 M915	Requires `MECHANICAL_GANTRY_CALIBRATION`.	tag optional description values S true Current value to use for the raise move. (Default: `GANTRY_CALIBRATION_CURRENT`) unit type mA int tag optional description values Z true Extra distance past `Z_MAX_POS` to move the Z axis. (Default: `GANTRY_CALIBRATION_EXTRA_HEIGHT`) unit type linear float	3jAFQdTk8iw	pre code Mechanical gantry calibration: G34

This command is used to align the ends of the X gantry. See the video demonstration above.

• The carriage moves to GANTRY_CALIBRATION_SAFE_POSITION, also called the "pounce" position.
• If possible, the Z stepper current is reduced to the value specified by S (or GANTRY_CALIBRATION_CURRENT) to prevent damage to steppers and other parts. The reduced current should be just high enough to move the Z axis when not blocked.
• The Z axis is jogged past the Z limit, only as far as the specified Z distance (or GANTRY_CALIBRATION_EXTRA_HEIGHT) at the GANTRY_CALIBRATION_FEEDRATE.
• The Z axis is moved back to the working area (also at GANTRY_CALIBRATION_FEEDRATE).
• Stepper current is restored back to normal.
• Finally the machine is re-homed, according to GANTRY_CALIBRATION_COMMANDS_POST.