Round N Round is our most ambitious build, a self-contained marble run driven entirely by mechanical gears. Switch on the motor and the lift carries marbles up to three interconnected tracks that weave, spiral, and cascade back to the start.
Every one of its 291 laser-cut wooden pieces fits without glue. Cams, ratchets, and gear trains do the work, and the alignment is the most demanding in the range. Once built, it is a living sculpture for your shelf, and a genuine piece of engineering you can say you built.
The motor and battery case are in the box. Batteries are not included.
