Last week we saw Holden Lab at Newcastle University start a discussion about using threaded fasteners to secure 3D printed parts. Dr. Robert LeSuer pointed out an extremely thorough discussion on the matter on 3DHubs.com .
3DHubs has an incredible wealth of information on DIY construction, including an amazing cost analysis of 3D printing vs CNC machining, showing when one method is going to be cheaper than the other. Check them out for tutorials on how to design your parts cheaply and effectively, and of course they offer 3D printing, CNC machining, and injection molding services just in case you need some help.
I just wish they would let us buy this as a nice little physical book. All that information can be hard to parse on a website.