This is the beginning of a series on practical prints for your 3D printer. Lots of people have seen 3D printers in action, but many of the prints are what can best be called novelty prints.

I used TinkerCAD to design this up. TinkerCAD has its limits, but it's very easy to use and for simple designs, very fast to work with. The key feature I used to create the captive nut channel and ...