In this way, the output burn is much more consistent. As the laser head accelerates toward the speed you request, the power level is increased as well. With variable mode, when the laser is stopped, the power level is zero. LightBurn uses 'variable power' mode by default (M4), where LaserGRBL uses 'constant power' mode (M3).

This is the most common problem we see, especially when comparing LaserGRBL output with LightBurn.

You're using 'Variable Power' mode (M4), and asking your machine to travel faster than it is able to.

If you have a GRBL device, there are two possible causes for this: Power output is not the same as other software (GRBL) ¶

For GCode controllers (GRBL, Smoothieware, etc) the Origin is almost always front-left, but in rare cases may not be.

For DSP controllers (Ruida / Trocen / TopWisdom / etc) the Origin setting for the device should match the corner that your laser homes to when first powered.

If you have the origin for the device set incorrectly, your output will be mirrored or upside down when run.

The ' Device Origin' setting, found in the menus under Edit => Device Settings, controls the orientation of what gets sent to your laser.

Troubleshooting Troubleshooting - Output Issues ¶ Output is mirrored or backwards ¶

Lightburn dsp