Well the firmware it runs on (Marlin 3d printer firmware) is gpl3:
https://github.com/MarlinFirmware/MarlinI use slic3r and printrun for printing which are also gpl3 (and in the debian stretch repos)
Well the firmware it runs on (Marlin 3d printer firmware) is gpl3:
https://github.com/MarlinFirmware/MarlinI use slic3r and printrun for printing which are also gpl3 (and in the debian stretch repos)