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All the credit goes to the guys from Evil Mad Scientist that went viral a few weeks ago with their new AxiDraw plotting machine:
I just did my own version so parts are printable. And I use Arduino instead of EBB board.
Firmware : https://github.com/misan/grbl-servo
Inkscape extension to create GCode files: https://github.com/misan/laser-gcode-exporter-inkscape-plugin
Use Universal GCode Sender to send files to the Arduino.
Update: I have added the kind contribution of Cesar Augusto Fernandez in the form of an easy-to-change-orientation pen-holder. And view-only Onshape files: https://cad.onshape.com/documents/236f46681d1cbe31f6d52db0 (you will need to create an account for being able to export parts to STL).