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You'll save time making your invention prototype if you take some preliminary steps before you begin.
Make detailed drawings in your inventor's journal or on your computer that show how you expect your new invention ideas will work and what each piece should look like. Using these drawings, build a preliminary prototype out of materials that you have around your home. You can build out of materials like cardboard or styrofoam. It doesn't matter at this point if your invention prototype is functional. This will help you see how things will fit together before you start spending money on the actual invention prototype.