Support for those had to be added to his Grbl_ESP32 firmware, as did dealing with the lack of homing switches in the plotter, and adapting the Grbl tool change command to the pen color change ...

They ship laser engravers that quite obviously use the Grbl firmware, or a modified version thereof, so [Norbert] asked them for the source code. They replied that it was a “business secret”.

The builders based on GRBL software and uses 2020 aluminium extrusions to create a 3-axis low-cost engraving and PCB manufacturing platform which is small enough to fit on your desktop.