response: I'm not sure what CAD is, but I do know about stereolithography. It's one of the most common file types for 3D printing.
history: I enjoy making sculptures. It is considered a plastic art. I've being toying with designing sculptures digitally with CAD and then 3d printing them.
knowledge: Stereolithography (STL) is one of the most common file types that is used for 3D printing.