---
tag: m0104
title: Set Hotend Temperature
brief: Set a new target hot end temperature.
author: thinkyhead

group: thermal

codes: [ M104 ]

notes: |
  - With `PRINTJOB_TIMER_AUTOSTART` this command will stop the print job timer if the temperature is set at or below half of `EXTRUDE_MINTEMP`.

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.<br/>`AUTOTEMP`: the min auto-temperature.'
    values:
      -
        tag: temp
        type: float
  -
    tag: F
    optional: true
    description: '`AUTOTEMP`: Autotemp flag. Omit to disable autotemp.'
    values:
      -
        tag: flag
        type: bool
  -
    tag: B
    optional: true
    description: '`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 for the active hotend
    code: M104 S185
  -
    pre: Set target temperature for E1
    code: M104 T1 S205
  -
    pre: '`AUTOTEMP`: Set autotemp range'
    code: M104 F S180 B190
  -
    pre: '`AUTOTEMP`: Disable autotemp'
    code: M104

---

Set a new target hot end temperature and continue without waiting. The firmware will continue to try to reach and hold the temperature in the background.

Use [`M109`](/docs/gcode/M109.html) to wait for the hot end to reach the target temperature.