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---
tag: m0109
title: Wait for Hotend Temperature
brief: Wait for the hot end to reach its target.
author: thinkyhead
group: thermal
codes: [ M109 ]
notes:
- With `PRINTJOB_TIMER_AUTOSTART` this command will start the print job if heating, and stop the print job timer if the temperature is set at or below half of `EXTRUDE_MINTEMP`.
- This command (as well as [`M190`](/docs/gcode/M190.html)) can block new commands from the host, preventing remote shutdown. However, if `EMERGENCY_PARSER` is enabled, a host can send [`M108`](/docs/gcode/M108.html) to break out of the wait loop.
- To set the hot end temperature and proceed without waiting, use [`M104`](/docs/gcode/M104.html).
parameters:
-
tag: I
since: 2.0.6
optional: true
description: Material preset index. Overrides `S`.
values:
-
type: int
tag: index
-
tag: S
optional: true
description: 'Target temperature (wait only when heating). Also `AUTOTEMP`: The min auto-temperature.'
values:
-
tag: temp
type: float
-
tag: R
optional: true
description: Target temperature (wait for cooling or heating).
values:
-
tag: temp
type: float
-
tag: F
optional: true
description: Autotemp flag. Omit to disable autotemp.
values:
-
tag: flag
type: bool
-
tag: B
optional: true
description: With `AUTOTEMP`, the max auto-temperature.
values:
-
tag: temp
type: float
-
tag: T
optional: true
description: Hotend index. If omitted, the currently active hotend will be used.
values:
-
tag: index
type: int
examples:
-
pre: Set target temperature and wait (if heating up)
code: M109 S180
-
pre: Set target temperature, wait even if cooling
code: M109 R120
-
pre: Set target temperature for E1 and wait (if heating up)
code: M109 T1 R205
-
pre: '`AUTOTEMP`: Set autotemp range, wait for temp'
code: M109 F S180 B190
-
pre: '`AUTOTEMP`: Disable autotemp, wait for temp'
code: M109
---
This command optionally sets a new target hot end temperature and waits for the target temperature to be reached before proceeding. If the temperature is set with `S` then [`M109`](/docs/gcode/M109.html) waits *only when heating*. If the temperature is set with `R` then [`M109`](/docs/gcode/M109.html) will also wait for the temperature to go down.
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