Linda Taalman has been teaching a 3D printer course at James Madison University

here is an AMS article on 3D printers

here is a wikipedia article on 3D printing

Here is what claims to be a 3D printing tutorial from Mma:

I found the following link using ?Export in Mma: guide/3DGeometryAndModelingFormats using Mma with no STL

■ STL is an acronym derived from stereolithography, discussed at Wikipedia: