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Build Your Own 3D Printer
One of the cooler concepts of home based 3D printing is that it originated out of a movement with a philosophy that these would be self replicating machines. You find someone to build the plastic parts for you, purchase the metal parts (screws, rods, bearings, etc) and electronics, put it all together and you’re all set. Once you’ve done this, you can print off parts for someone else to build their own printer or for you to build a second printer, etc. This is the RepRap project. If you’re technically inclined, you can check out their wiki site, look at some of the different printer types, and make your own!