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sbaker writes "3D Printers (or 'Rapid prototyping machines') can produce arbitary three dimensional objects in plastic or sometimes metal directly from a CAD model — just like printing a picture on your trusty inkjet. These nifty gadgets typically cost a prohibitive $20k — but what happens if such things cost just $5k. Once this baby hits the streets, other manufacturers will have to follow. Did the world just change?"