Desktop 3D printers lend themselves to not only making things, but to making the machines themselves through the open source movement. Electrical engineer John Fuoco is accustomed to solving problems, and turned his experience to his own 3D printers. Starting with a Bukobot kit and extending its X-axis, then moving on to a FoglgerTech delta-style 3D printer kit and making improvements to its probe arm for the servo, Fuoco's printer hacks are pretty impressive. He's also made his design adjustment available on Thingiverse. Read about his processes at 3DPrint.com: http://3dprint.com/87898/3d-printer-hacks/