Remixed from: https://www.thingiverse.com/thing:3510883
I wanted a spacer/tower into which balls could be dropped and then be ejected from the side.
The tower can be printed upright, without supports.
As per the original design, the connector ring should be printed upside down, then glued to the underside.
Printing the connector ring at 101% gives me the most snug fit on the baseplates.
The author marked this model as their own original creation.