This command enables the laser engraving PWM output at the level specified by the S command.

The Laser M3 Gcode command works with the G200 Q command to ramp power levels

This command is used for engraving applications such as photos dither dithered of Grayscale.

It is important to note that the M03 command works with motion and the PWM output level will not change until there is motion from 1 or more axis. 
The Laser M3 Gcode command is not a laser on command but enables the laser and if an S value it will not change the current PWM output level until there is motion.

If immediate turning on of the Laser is required without motion then use M04

For the best motion is it recommended that a single M3 is used at the start of the Gcode file and S0 is used to change the laser power to 0 when moving between different toolpaths.

Syntax & Parameters

• M03 - Laser enabled with motion. Can be used or without S value.
• M3 - The same as M03
• S - The S value is optional and  can be 0 to 1000. It defines the PWM power level of 0 to 100%. If the S value is not given then the last S value is automatically used.

Example program

N10 G0 X0 Y0
N20 M03 S500
N30 G1 X10 Y10 F1000
N40 G1 X20 Y10 S800
N50 M5

In this example

N10 - Move to X0 Y0 at rapid speed

N20 - Laser power output enabled at 50% - Laser remains off as there has been no motion

N30 - Axis moves to X10 Y10 with laser on at power level 50% at a feed rate of 1000

N40 - Axis moves to X20 Y10 with laser on at power level 80%

N50 - Laser turns off

Also See G200 - Laser Parameters for additional functionality