Every product you see was designed. Most of these were designed using three-dimensional CAD tools. This means that most of the things we use already have 3D models somewhere out there. Thingiverse is a great place to share the objects you have created and download the objects shared by others. But what about all the things not on Thingiverse? McMaster-Carr is full of 3D models for various parts. Do you know of any others?