machines/systems/flexibot/docs/marlin/_gcode/M603.md

tag	title	brief	author	since	requires	group	codes	notes	parameters	examples
m0603	Configure Filament Change	Configure automatic filament change parameters	ManuelMcLure	1.1.0	ADVANCED_PAUSE_FEATURE	filament	M603	Requires `ADVANCED_PAUSE_FEATURE`.	tag optional description values T true Target extruder tag type index int tag optional description values U true Amount of retraction for unload (negative) tag type pos float tag optional description values L true Load length, longer for bowden (negative) tag type pos float	pre code Configure load and unload lengths for automatic filament change M603 U120 L125

The M603 command configures automatic filament change parameters.