Printing 3D printer hardware upgrades from the same 3D printer is an incredibly cool concept. How much did it cost you to build? What kind of materials does i

Printing 3D printer hardware upgrades from the same 3D printer is an incredibly cool concept. How much did it cost you to build? What kind of materials does it use? Does it heat up plastic or apply something to get the material to harden or how does it work? Are the input materials reasonably priced? I've found: http://reprap.org/wiki/Prusa_i3 http://reprap.org/wiki/Prusa_i3 which says ~$150, is that accurate from your experience? Also: https://github.com/josefprusa/Prusa3 https://github.com/josefprusa/Prusa3 http://reprap.org/wiki/Prusa_i3_Build_Manual http://reprap.org/wiki/Prusa_i3_Build_Manual http://reprap.org/wiki/Prusa_i3_Buyers_Guide http://reprap.org/wiki/Prusa_i3_Buyers_Guide http://www.ebay.com/bhp/prusa-i3 http://www.ebay.com/bhp/prusa-i3 Does anyone know of any similar or better types of open-source 3D printers?