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While a crude prototype can be made with cardboard and glue, a working and final prototype must begin to both resemble and work like a real product. Here are some basic manufacturing methods that you might craft your prototype with.
Casting: You can make parts of your prototype from a liquid metal or plastic that hardens into a specified shape and size. Casting is produced with a mold, and can be done in metal, plastic or rubber.
Machining: Starting with foam, metal, plastic or wood, lathes, grinders and milling machines are used to take material away to achieve the shape you need.
Fabricating: Sheets of metal or plastic can be cut, bent, folded and in the case of plastic – vacuum formed to create shapes.