we upgraded a chinese 50W Laser to RAMPS1.4 with turnkey tyranny Marlin.
Gcode prepared with Lightburn works on the Laser via SD card
But we fail to steer it via USB: no homing, no lasering.
We tried several Windows devices.
The Marlin does not recognized when scanning for machines (not sure whether it can?),
Therfore we have set up the machine manually (rear left, 400x400, Marlin).
Does anybody have a clue how to connect via USB?