Grbl firmware was originally designed for CNC machines and 3D printers, with laser support added more recently. Set your machine status reporting to be relative to the workspace origin, not the machine origin ($10=0).If your machine uses negative workspace coordinates you'll need to apply a workspace offset (G10 L2 P1 xx yy).You might need to enable 'Laser Mode' if you have GRBL 1.1f or later ($32=1).

The value in LightBurn is called 'S-Value Max', in the Device Settings. You might need to adjust your spindle max RPM value ($30) to match the LightBurn default (1000) or vice versa.If your laser disconnects for some reason, or enters an alarm state and needs to be reset, you can quickly re-connect by right-clicking the 'Devices' button in the Laser Window.If you have a GCode-based system, like a Shapeoko, Eleksmaker, X-Carve, or Acro system, you might need to make some simple changes to get the most from LightBurn. If no ports are listed in the drop-down, it means that no devices were found, which could mean that it is not plugged in correctly, isn't powered, or you're missing a driver.

If you see the '(Choose)' as shown above, you need to select the port. If you reboot your computer, or plug the controller into a different USB port, you might need to re-select it. If you have more than one laser set up, you might need to select the one to connect to by clicking here:ĭepending on the type of controller you have, you might have to manually choose the port that the laser is connected to, by clicking where you see '(Choose)' in the Laser Window:Īs long as your laser is connected to the same communication port, LightBurn will reconnect when you re-start. If you only have a single laser, it will be automatically chosen for you. Once you have added your laser to LightBurn, it should appear in the list of devices to the right of the 'Devices' button in the Laser Window.

Lightburn cnc