This is a fun remixed marble machine. It is unbalanced so you will need to make a support bean and attach it on. This was made for 3/8 inch steel marbles but is compatible with some others. You will need a small nail to get the ball carrier attached to the frame. Credit to "qrry" for the original design https://www.thingiverse.com/qrry/about. For this to work you need to spin this to the right. So have fun.
Glow in The Dark Blue
In the photos I left some supports on.