flexi-bot/docs/marlin/_gcode/G026.md

tag	title	brief	experimental	since	requires	group	codes	notes	parameters	examples
g026	Mesh Validation Pattern	Test the mesh and adjust.	true	1.1.0	G26_MESH_VALIDATION	calibration	G26	- Before 1.1.6 it only works with `AUTO_BED_LEVELING_UBL`. - Since 1.1.7 it also works with `MESH_BED_LEVELING` and `AUTO_BED_LEVELING_BILINEAR`.	tag optional description values B true Bed temperature (otherwise 60°C) to use for the test print. type tag int temp tag optional description values C true Continue with the closest point (otherwise, don't) type bool tag optional description values D true Disable leveling compensation (otherwise, enable) type flag tag optional description values F true Filament diameter (otherwise 1.75mm) type tag float linear tag optional description values H true Hot end temperature (otherwise 205°C) to use for the test print. type tag float linear tag since optional description values I 2.0.6 true Material preset to use for the test print. Overrides `S`. type tag int index tag optional description values K true Keep heaters on when done type bool tag optional description values L true Layer height to use for the test type tag float linear tag optional description values O true Ooze amount (otherwise 0.3mm). Emitted at the start of the test. type tag float linear tag optional description values P true Prime Length type tag float linear tag optional description values Q true Retraction multiplier. `G26` retract and recover are 1.0mm and 1.2mm respectively. Both retract and recover are multiplied by this value. type float tag optional description values R true Number of `G26` Repetitions (otherwise 999) type int tag optional description values S true Nozzle size (otherwise 0.4mm) type float tag optional description values U true Random deviation. (`U` with no value, 50). type tag float linear tag optional description values X true X position (otherwise, current X position) type tag float linear tag optional description values Y true Y position (otherwise, current Y position) type tag float linear

G26 Mesh Validation Pattern is designed to be used in conjunction with mesh-based leveling to test the accuracy of the probed mesh.

The G26 command prints a single-layer pattern over the entire print bed, giving a clear indication of how accurately every mesh point is defined. G26 can be used to determine which areas of the mesh are less-than-perfect and how much to adjust each mesh point.