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In order to begin building your invention prototype, you should have a solid idea of how your invention will work. You also should have a working prototype before you start showing your invention at trade shows. The process of building a prototype will almost always take longer than you anticipate, so give yourself plenty of time. One of the benefits of building an invention prototype is that design flaws will become apparent as you build. You'll be forced to modify your design until it is efficient and working smoothly.