The stepper controller is an Arduino Mega running the Marlaser firmware, though [Owen] admits perhaps a laser cutter-specific driver board would have been better as he spent many hours trying to ...

including an integrated laser driver, an updated RX front-end optimized for optical signaling, and a non-linear DSP equalization that corrects for both static and dynamic nonlinearity components.

It’s not really a drive, but a dongle to unlock the laser driver software. I had to go and find my USB cd drive before using the K40. Most of the filenames on the disc are in Chinese.