@ScottP , if you want any pointers on 3D autocad design, my husband has used it some, although he finds CAD on its own perfectly useable in most applications, but he has done some 3D work with CAD 3D. A license is not cheap, either. But if you have any general questions about it, I'm pretty sure he'd be happy to offer some pointers. He's done CAD design pretty much non-stop, etc.
Good luck, man, having a decent 3D printer in a library? LOL around here, we barely have ebooks. LOL.
Anna