Instructables contributor Deividmaxx, who recently bought an inexpensive kit for making the Prusa i3 3D printer, was not especially happy with the quality of the prints his new machine produced. In response, he decided to upgrade the machine and, when possible, to program it to print its own replacement parts. He provided 17 detailed instructions, including schematics and supplies lists on his Instructables page. Check out more details about his DIY upgrading at 3DPrint.com: http://3dprint.com/98953/upgrade-your-cheap-3d-printer/