Over-the-Top Marble Machine
thingiverse
This clever marble machine relies on 6mm Airsoft BB's to serve as its balls. As they reach the bottom, a simple tap of the little thwacker sends them flying back over the top and all the way to the start. It's actually more demanding than it initially appears! See how many balls you can keep circulating at the same time. Additionally, this machine prints in one solid piece (excluding the feet) with no supporting structures required! Check out its operation: https://youtu.be/Q6aKoDP1uTw
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