flexi-bot/docs/marlin/_gcode/M191.md

tag	title	brief	author	contrib	group	codes	notes	parameters	examples
m0191	Wait for Chamber Temperature	Wait for the chamber to reach target temperature.	shitcreek	thinkyhead	thermal	M191	This command (as well as [`M109`](/docs/gcode/M109.html) and [`M190`](/docs/gcode/M190.html)) can block new commands from the host. To break out of wait for temperature using [`M108`](/docs/gcode/M108.html) from the host, enable `EMERGENCY_PARSER`. Use [`M141`](/docs/gcode/M141.html) to set the chamber temperature and proceed without waiting.	tag optional description values S true Target temperature (wait only when heating). tag type temp float tag optional description values R true Target temperature (wait for cooling or heating). tag type temp float	pre code Set target chamber temperature and wait (if heating) M191 S80 pre code Set target chamber temperature, wait even if cooling M191 R40

This command optionally sets a new target chamber temperature and waits for the target temperature to be reached before proceeding. If the temperature is set with S then it waits only when heating.