Meet the orb drop: a DIY marble run that you can build on your own to get some hands-on STEM-related experience. It is available in manual and automatic versions. The latter is powered and picks up the orbs at the end of the track and drops them back at the beginning.
More gadgets like this: here
Both versions have a twist connection system that allows you to put them together without any glue. Expected to ship in August.
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