# \[Marlin] M104 - Set Hotend Temperature

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**📅Update: 2020/09/18**
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## Description

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`](https://app.gitbook.com/docs/gcode/M109.html) to wait for the hot end to reach the target temperature.

## 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`.

## Usage

`M104` `[B<temp>]` `[F<flag>]` `[I<index>]` `[S<temp>]` `[T<index>]`

### Parameters

* `[B<temp>]` `AUTOTEMP`: The max auto-temperature.
* `[F<flag>]` `AUTOTEMP`: Autotemp flag. Omit to disable autotemp.
* `[I<index>]` Material preset index. Overrides `S`.
* `[S<temp>]` Target temperature. `AUTOTEMP`: the min auto-temperature.
* `[T<index>]` Hotend index. If omitted, the currently active hotend will be used.

## Examples

Set target temperature for the active hotend

```
M104 S185
```

Set target temperature for E1

```
M104 T1 S205
```

`AUTOTEMP`: Set autotemp range

```
M104 F S180 B190
```

`AUTOTEMP`: Disable autotemp

```
M104
```