What is 3D CAD Software? 3D CAD is what most people think of when they are talking about CAD. Conceptually, it’s the digital equivalent of fabrication tools and a wax carving kit. Rather than just simply making designs on a screen, the user is actually building his design to exact tolerances and specifications. The end result of CAD can be either rendering (producing a photorealistic image) or rapid prototyping (producing a physical model for use in manufacturing). CAD models are often (and incorrectly) referred to as “drawings”. Since they are still technically 3D even if they’re only stored on a computer, it’s better to call them “3D models”. Using 3D CAD for product design is not a new thing. The first military applications of CAD/CAM appeared in the 1960’s, and the first commercial product design with CAD started happening in the late 1980’s. But it wouldn’t be an exaggeration to say that there is no field of product design which doesn’t use some form of CAD for manufacturing.