thingiverse
Ball Machine
This is a ball machine that circulates ball bearings on a track by turning the handle. It is only a prototype, so there are a few things I would change if I ever revisit this design for an improved version. First of all, the track should be sloped downward where the track meets the large gear to force the ball into the hole. The top of the track should also have a more forgiving entry point so the ball rolls smoothly onto the track.
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