The Marble Box (centralpetal force puzzle)
cults3d
This is a puzzle that I originally saw at my eye doctor. You have to get the marbles in the holes at the same time. It is very possible! Have your friends mess with it until they until they rage quit, then show them the trick. Post-Printing After printing, you drop a small BB in each side. You need a roof of some kind. I used a piece of clear plastic from a toy package. You can glue it, or there are little holes for thumb tacks. The Trick To solve the puzzle, you set it on a flat surface at spin it clockwise.
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