I need help error 20

LightBurn Software Questions OS Specific
2

Assuming the error is GRBL’s Error 20, it’s generally caused by:

  • Selecting the wrong device type (you want plain GRBL)
  • Having G-Code Clustering turned on in Edit → Device Settings

I think device auto-detection sometimes gets those wrong, so you may not have seen those choices go past while setting up the laser device.

The Diode Laser Wiki has far more detail on LightBurn’s settings:

His preconfigured S30 device profile may come in handy.

If tweaking those settings doesn’t get it running, other folks around here can give you more specific help.