---
tag: m0003
title: Spindle CW / Laser On
brief: Set the spindle CW speed or laser power
author: thinkyhead
contrib: shitcreek

group: control
since: 1.1.2
requires: SPINDLE_LASER_ENABLE

codes: [ M3 ]
related: [ M4, M5 ]

notes:
- '`S` is interpeted as the configured value range: PWM (default), Percentage, or RPM. (See `CUTTER_POWER_UNIT`)'
- "`M3` and [`M4`](/docs/gcode/M004.html) aren't needed with `LASER_POWER_INLINE` and `LASER_MOVE_POWER` enabled. Power is set directly in [`G1`](/docs/gcode/G000-G001.html)…[`G5`](/docs/gcode/G005.html)"

parameters:

- tag: S
  optional: true
  description: Spindle speed or laser power in the configured value range (see `CUTTER_POWER_DISPLAY`). (PWM 0-255 by default)
  values:
  - tag: power
    type: int

- tag: O
  optional: true
  description: Spindle speed or laser power in PWM 0-255 value range
  values:
  - tag: power
    type: int

- tag: I
  optional: true
  description: Inline mode ON / OFF.
  values:
  - tag: mode
    type: bool

examples:

- pre: Set spindle rotation clockwise at 50% with `CUTTER_POWER_UNIT` set to `PERCENT`
  code: M3 S50

- pre: Set spindle rotation clockwise at 6K RPM with `CUTTER_POWER_UNIT` set to `RPM`
  code: M3 S5000

- pre: Set laser power to 50% in PWM
  code: M3 O128

- pre: Turn on the laser at full / `SPEED_POWER_STARTUP` power
  code: M3

- pre: Fire laser at 80% on next G1,G2 and G3 move
  code: M3 S204 I

---

Wait for moves to complete, then set the spindle speed (clockwise) or laser power.
