carousel with a ball track motor from bambulab /Marble Run 003/.
We built a ball track with the children, but we had an extra engine, so we invented a carousel where you can get your favorite characters.
In addition to the pins, I recommend connecting the larger wheel to the smaller one with instant glue so that the pins do not break off.
you can find the engine here: https://eu.store.bambulab.com/en-sk/products/marble-run-components-kit-003