Here is another compact marble machine with motorized movement that puts on a show on your desk. The 3D Printed Marble Run is USB powered. It has a footprint of 6 x 6 x 2 inches. According to the maker, Paul Kemp, this machine accepts 8mm marbles. The 30 marbles supplied move 5.4 miles in an hour in this machine.
More gadgets like this: here
This marble toy is currently being sold on Etsy. You can find out more about it here.
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