---
tag: m0108
title: Break and Continue
brief: Break out of the current waiting loop
author: thinkyhead

group: control

codes: [ M108 ]

notes:
  - |
    With both `EMERGENCY_PARSER` and `HOST_KEEPALIVE_FEATURE` enabled, hosts will be able to prompt for continuation or cancellation, confirming with [`M108`](/docs/gcode/M108.html) and cancelling with [`M112`](/docs/gcode/M112.html).

parameters:

example:
  -
    pre: Use [`M108`](/docs/gcode/M108.html) as a "Continue" button in your host software.
    code:
      - M0 You're up, mate ; in your G-code file
      - M108               ; as your "Continue" button

---

The [`M108`](/docs/gcode/M108.html) command requires `EMERGENCY_PARSER` for full effectiveness. (Otherwise a full queue blocks the parser.)

Some G-code commands cause Marlin to go into a closed loop, waiting indefinitely for a certain state or event. For example, [`M109`](/docs/gcode/M109.html) waits for the target temperature to be reached, and [`M0`](/docs/gcode/M000-M001.html) waits for an LCD click.

In the case of [`M109`](/docs/gcode/M109.html), the [`M108`](/docs/gcode/M108.html) command stops waiting for the target temperature and continues processing G-code. This may result in "cold extrude" messages. For a full stop use [`M112`](/docs/gcode/M112.html).

In the case of [`M0`](/docs/gcode/M000-M001.html) the [`M108`](/docs/gcode/M108.html) command acts like the LCD button, breaking out of [`M0`](/docs/gcode/M000-M001.html) and continuing to process the G-code queue.