Summary

This marble pump takes in marbles from one side and pushes them out the other. The concept is the basis for many marble machine types but I basically went down the rabbit hole of working on the pump and didn't make it to making machines :P

I Wrote an Instructable for this:
https://www.instructables.com/id/Marble-Pump-3D-Print/

I've also Included the Inventor files for an unfinished version 62 in case you are in to that sort of thing.