The first step is to perfect your world-changing widget. Computer-aided design (CAD) software used to be pricey and hard to use, but new tools such as Autodesk 123D Design, Blender, Google SketchUp, and Tinkercad make designing virtual 3D objects easy. Or build your widget by hand, and use Autodesk's 123D Catch to convert digital images of it into a CAD file.
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