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Most of the RP technologies are additive; that is, the model is made automatically by building up contoured laminations sequentially from materials such as photopolymers, extruded or beaded plastic, and even paper until they reach the desired height. These processes can be used to form internal cavities, overhangs, and complex convoluted geometries as well as simple planar or curved shapes. By contrast, a subtractive RP process involves milling the model from a block of soft material, typi- cally plastic or aluminum, on a computer-controlled milling machine with commands from a CAD-derived program....