Magnetic (fridge) Marble Run
thingiverse
You can build a marble machine that can be rebuilt repeatedly on your fridge or any other magnetic surface. I'm using neodymium magnets 10mm in diameter and 2-2.5 mm thick. The blue tubing visible in the picture is leftover protective tubing from a water installation held up with hard drive magnets. The parts are designed for marbles approximately 16-17 mm in diameter. I cut and glued an acrylic front on the marble divider, which prevents the marbles from flying everywhere if not done. https://youtu.be/yRDBU4SsTeA
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