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This is a fun gadget that you can have you in house to show your friends how the sphere was printed inside the rail and you can never detach it!
https://www.shapeways.com/model/edit/605978/ [NEW] Buy the v2.0!:
https://www.shapeways.com/model/108596/rail-with-a-ball-inside-keychain.html Buy the Keychain version