The problem with expensive kit is that it so often all hinges on some two-penny plastic sprocket or clip, and if that breaks then all the rest comes tumbling down. You could get out your whittling knife and superglue in order to make a replacement, although for things with intricate interiors the Ponoko fabrication service might be a more advanced and precise answer to the problem, possibly in combination with Google’s Sketchup Pro software.

Although, at the moment, Ponoko seems to be finding a niche among product designers and craft makers.