Walltracks Gravity Well

Part of my Walltracks marble rollercoaster set: https://www.thingiverse.com/tylerecouture/collections/walltracks-wall-mounted-marble-coaster

Remixed from https://www.thingiverse.com/thing:4224154 (thinigverse won't load any remix search results)

I found the nubs to be useless so I just cut them off. The bottom was hard to snap into the top but I got it eventually then glued them together.

In action: https://youtu.be/SQiL6hxIF7E