This was "Marble Machine Kaleidoscope by Yosuke_Ikeda" on Thingiverse actually, sorry. (edited)
AlgoLoop : Marble Machine by Yosuke Ikeda
A Simple hand-powered marble machine with infinite possibilities
(Model recreated in Plasticity)
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updated June 15, 2024
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What a fun model! Kind of like an infinite version of those stair toys. Printed in Bambu PLA basic blue.
I've seen video of the 4-loop in action and it works flawlessly. Your video of the 4 loop and my experience with it is disappointing. The marbles don't travel around that inside loop consistently. I cannot figure out how to change the model to encourage a more consistent operation.
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@tfrisina_263780 you could try the original version https://www.thingiverse.com/thing:4429805
@munzli Hey, that's a good idea. That model seems to have a ledge on the inside of the track to retain the marble. Thanks for the tip!