I connected a laser to the OPEN-CNC-Shield and recorded the whole procedure in the following video.
By the way, the adapted firmware should also work with the Tillboard Extension or the Arduinoclub board. At least the most important functions for lasering. Actually all Estlcam boards with Arduino Mega base should work with it.
Here is the link to the Gitlab repository for the GRBL software with adapted pinout: Gitlab GRBL
More useful links: