I’ve already said how much I appreciate Zaggo’s designs. Watching his treasure chest being built on my ‘bot was really really cool. The hinge pins were printed already inside of the hinge – something made possible by the nature of fused deposition modeling.
While this toy car by kparanya was probably the first captive breakaway multipart print I’ve seen on Thingiverse, I was more inspired by Zaggo’s treasure chest. :) It should be possible to print entire geared assemblies using this kind of system. Admittedly, you’re probably not going to get precision geared parts, but you could probably make a decent toy or rough tool. Once you start using the piece it should essentially grind out any extra plastic threads.
Anyhow, something to think about.