We visited Franz yesterday at took a look at his operation. San even made nice video and put it here : http://www.youtube.com/watch?v=DIaBfVBiNN8 The printer selected was the Prusa i3. I will post updates on how it works and the assembling of the machine. Update 8/9/2013 It works at last at last... Some pictures of the construction After a build that took about 30 hours of soldering, improvising and tweaking, including getting all the software set up correctly.