http://hackaday.com/2015/02/23/cnc-milling-photos-with-a-halftone-generator/
http://hackaday.com/2015/02/23/twinteeth-the-delta-bot-pcb-factory/
K8400 DualHotEnd MOD
http://507movements.com/mm_130.html
Make the aluminum bed flat
http://forum.velleman.eu/viewtopic.php?f=58&t=13316
Parts repo
https://github.com/Velleman/Vertex
http://www.instructables.com/id/eWaste-60-3DPrinter/?ALLSTEPS