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This was for the movingpart contest, where I was the second winner: http://www.shapeways.com/blog/archives/211-Moving-part-contest-winner!.html The model is made with four unconnected parts. See the images for details and the construction of the hinges. Clearance for the hinges is 0.5 mm. I used ViaCAD to construct it. I just received it and it works! See this video: http://www.youtube.com/watch?v=jwfXlcQ06cI