flexi-bot/docs/marlin/_gcode/G038.md

tag	title	brief	author	since	requires	group	codes	notes	parameters
g038	Probe target	Probe towards (or away from) a workpiece	thinkyhead	1.1.0	G38_PROBE_TARGET	calibration	G38.2 G38.3 G38.4 G38.5	These commands require `G38_PROBE_TARGET` and a defined probe. `G38.4` and `G38.5` are only available with the `G38_PROBE_AWAY` option.	tag optional description values X true Target X tag type pos float tag optional description values Y true Target Y tag type pos float tag optional description values Z true Target Z tag type pos float tag optional description values F true Feedrate for the move tag type rate float

The Probe Target commands are used to probe towards (or away from) a workpiece to determine its precise position. You might, for example, use a grounded metal workpiece, with a metal probe spliced into the bed probe circuit.

• G38.2 probes towards a target and stops on contact, signaling an error if it reaches the target position without triggering the probe.
• G38.3 probes towards a target and stops on contact. No error is given if it fails to trigger the probe.
• G38.4 probes away from a target and stops on contact break. An error is signaled if the target position is reached without triggering the probe.
• G38.5 probes away from a target and stops on contact break. No error is given if it fails to trigger the probe.

These commands use the current homing feedrate, by default.