It's the Internet Revolution meets the Industrial Revolution: a new program that lets people design 3-D objects like car parts and door knobs in metal or plastic then order them online.

Programs for computer-aided design, or CAD, have been around for decades, but eMachineShop.com appears to be the first service that checks whether a design can be made, tells the customer how much it will cost. If the customer wants the item the design goes to a "real world" machine shop for manufacturing.
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Source : The Associated Press