machines/systems/flexibot/docs/marlin/_gcode/M106.md

tag	title	brief	author	group	requires	codes	notes	parameters	example
m0106	Set Fan Speed	Turn on the fan and set its speed	thinkyhead	thermal	EXTRA_FAN_SPEED	M106	[`M106`](/docs/gcode/M106.html) with no speed sets the fan to full speed. Turn off fans with [`M107`](/docs/gcode/M107.html).	tag since optional description values I 2.0.6 true Material preset index. Overrides `S`. type tag int index tag optional description values S true Speed, from 0 to 255. S255 provides 100% duty cycle; S128 produces 50%. tag type speed byte tag optional description values P true Fan index tag type index int tag optional description values T true Secondary speed. Added in Marlin 1.1.7. (Requires `EXTRA_FAN_SPEED`) - `M106 P<fan> T3-255` sets a secondary speed for `<fan>`. - `M106 P<fan> T2` uses the set secondary speed. - `M106 P<fan> T1` restores the previous fan speed. tag type secondary int	pre code Turn on the fan at 200/255 DC M106 S200

Turn on one of the fans and set its speed. If no fan index is given, the print cooling fan is selected. The fan speed applies to the next block added to the planner, so it will not take effect until previous moves in the planner are done. Under manual control with an idle machine, M106 will change the fan speed immediately.