flexi-bot/docs/marlin/_gcode/M423.md

tag	title	brief	author	requires	since	group	codes	related	notes	parameters	examples
m0423	X Twist Compensation	Modify, reset, and report X-Axis Twist Compensation data	thinkyhead	X_AXIS_TWIST_COMPENSATION	2.0.9.4	calibration	M423	G29		tag optional description values R true Reset the Twist Compensation array to the configured default values. type flag tag optional description values A true Set the X-Axis Twist Compensation starting X position. tag type linear float tag optional description values I true Set the X-Axis Twist Compensation X-spacing. tag type linear float tag optional description values X true Zero-based index into the Twist Compensation array. Requires a `Z` value. tag type index int tag optional description values Z true A Z-offset value to set in the Twist Compensation array. Requires an `X` index. tag type index int	pre code Report the current X-twist data to the host console. M423 pre code Reset X-twist data to the configured defaults. M423 R pre code Set the 5th value in the Twist Compensation array to -0.03. M423 X4 Z-0.03 pre code Set the X-start position to 0 and the X-spacing distance to 50. M423 M423 X0 I50

Use M423 to reset, modify, or report X-Twist Compensation data.

X-Twist Compensation is applied to the mesh on G29) to correct for a twisted X gantry. Meaningful X-Twist Compensation data is generated using a guided procedure in the LCD menu that compares measurements taken by the bed probe to readings taken manually at the nozzle. Since manual measurements are prone to inaccuracy, a metal feeler gauge is recommended over a paper test. If the first layer is still imperfect, M423 can then be used to correct for small errors.