Motorized Marble Track
thingiverse
A motorized marble track, it has four sections the brings the marbles up the center to each new section. Video of it running is Here: https://youtu.be/Wwy11XhCug8 It runs on a 18650 battery and would probably go for about 10hrs or so before recharge. It uses 9.5mm (3/8") steel balls as the marbles.
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