flexi-bot/docs/marlin/_gcode/M004.md

tag	title	brief	author	contrib	since	requires	related	group	codes	notes	parameters	examples
m0004	Spindle CCW / Laser On	Set the spindle CCW speed or laser power	thinkyhead	shitcreek	1.1.2	SPINDLE_LASER_ENABLE	M3 M5	control	M4	S is interpeted as the configured value range: PWM (default), Percentage, or RPM. (See `CUTTER_POWER_UNIT`) [`M3`](/docs/gcode/M003.html) and [`M4`](/docs/gcode/M004.html) aren't needed with `LASER_POWER_INLINE` and `LASER_MOVE_POWER` enabled. Power is set directly in [`G1`](/docs/gcode/G000-G001.html)…[`G5`](/docs/gcode/G005.html)	tag optional description values S true Spindle speed or laser power in the configured value range (see `CUTTER_POWER_UNIT`). (PWM 0-255 by default) tag type power byte tag optional description values O true Spindle speed or laser power in PWM 0-255 value range tag type power byte tag optional description values I true Inline mode ON / OFF. tag type mode bool	pre code Set spindle rotation counter-clockwise at 50% with `CUTTER_POWER_UNIT` set to `PERCENT` M4 S50 pre code Set spindle rotation counter-clockwise at 50% with `CUTTER_POWER_UNIT` set to `PWM` M4 S128 pre code Set spindle rotation counter-clockwise at 80% in `PWM` M4 O204 pre code Turn on the laser at full / `SPEED_POWER_STARTUP` power M4 pre code Fire laser at 80% on next G1,G2 and G3 move M4 S204 I

Wait for moves to complete, then set the spindle speed (counter-clockwise) or laser power.