A super simple, quick and dirty shield for the bq ciclop ( only the essential parts, no fuses etc. ) http://www.thingiverse.com/thing:740357 . You can look at https://github.com/bq/zum/blob/master/zum-scan/bqZUM_Scan_Shield_Rev.4.PDF and the JPG for the parts and alignment. The only change i did was the ULN2003 instead of the mosfet's for the control of the laser. On the right side you have to solder a bridge. Powered from the UNO DC-in jack. Use only at your own risk, is used the parts that i had at home, still a betaversion/work in progress .Etching howto : http://fritzing.org/learning/tutorials/pcb-production-tutorials/diy-pcb-etching/ http://www.instructables.com/id/PCB-etching-using-laser-printer/