DIY 3D Printers are unassembled machine that you will gain a better idea of how these machines work and what the different components or parts are that go into them. And, perhaps even more importantly, a 3D printer kit will allow you to test out the technology for a minimal investment.Prusa i3 (i3 stands for third iteration of the design) is the latest design by Joseph Prusa. There are countless variations of the design and it became a staple of 3D printing with tens, if not hundreds, of thousands units world wide. You can build simple one for couple hundred dollars or you can chip in more and get the state of the art 3D printer.