Rolling Ball Sculpture

Description
 
4.5 w x 5.5 d x 3.0 h in cm |

This rbs is the regular sized one I had printed. (I tried scaling smaller from here). It's about 1-7/8 inches tall. The track separation is about 5/8 inches wide. It works fine. See the video.

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Why print the ball? Can't one just use a marble?
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