After midnight, it's dark and nearly silent in the Klock Werks Kustom Cycles shop (kustomcycles.com) in Mitchell, S.D. The only sound is the low hum emanating from a box that looks like a cross between a dormitory fridge and a Xerox machine. Behind a compartment of clear glass, the device - a Stratasys Prodigy 3-D printer - is constructing a complex shape, all curves and spaces, out of plastic.
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