Comment: Re:Hard-to-find Monorail? 3-D printing to the resc (Score 1) 41
I have some of those old monorail pieces (I had no idea they were valuable - should probably did them out), and I doubt that you could 3D print them at the moment. The key part of the centre rail is that it's toothed, with the train itself being driven by a vertically mounted motor in the centre power unit, engaging the fine-toothed track with a metal cog.
I just don't think that a 3D printer can produce the level of accuracy needed for that sort of track with enough strength to withstand the metal traction cog.