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3D Self-Replicating Printer to be Released Under GNU License
Rob O'Neill writes "A Kiwi open source developer is working on a self-replicating 3D printer, RepRap, to be made available under the GNU license. 'The 3D printer works by building components up in layers of plastic, mainly polylactic acid (PLA), which is a bio-degradable polymer made from lactic acid. The technology already exists, but commercial machines are very expensive. They also can't copy themselves, and they can't be manipulated by users, says Vik Olliver. RepRap has a different idea. The team, which is spread over New Zealand, the UK and the US, develops and gives away the designs for its much cheaper machine, which also has self-copying capabilities. It wants to make the machine available to anybody — including small communities in the developing world, as well as people in the developed world, says Olliver. Accordingly, the RepRap machine is distributed, at no cost, under the GNU (General Public License).'"
How does it copy its circuit boards and metallic components? Does it have a little semi-conductor factory?
Here's the real site. Look at the picture. The machine can make the white plastic parts. Not the motors, not the leadscrews, not the frame rods, not the belts, not the wiring, and not the control electronics. The parts it is making look like about $10 worth of injection molded plastic - the cheap parts.
Wrong; that's not $10 worth of injected-molded plastic, that's thousands of dollars worth at least.
Injection-molded plastic, as the name implies, requires a mold, and a machine to inject plastic with. Molds are expensive, as are these machines. Do you have the facilities at home to make injection-molded plastic parts? No? Then it's going to cost you a fair bit of money to send your CAD drawings to a place for them to make a mold and produce parts for you in large quantities. You say you only need one? Too bad. The cost isn't much different whether you want one or 1000.
That "$10 worth" of parts is only $10 when someone has gone to the trouble of making molds and doing a production run in the thousands or more.
With a machine like this, those parts can be made for next to nothing. You'll still have to add motors, leadscrews, belts, wiring, etc., but all that stuff is easily bought off-the-shelf, since it's all standardized. Special plastic parts for your particular application aren't available off-the-shelf, and that's the problem solved here.