This module is definitely one of my favorites. I was surprised how easy the setup was after printing the parts. The only thing I had to make sure was that the edges of the ramp are absolutely smooth. I had a small burr on one side and the marbles missed the funnel. After cleaning this the module now is perfectly stable and I do not loose marbles at all. Great Design!!!
This one is so fun when it works! I love watching the balls fly through the air. The balls are flying off the side of the track though. I'm going to print again and see if it was my fault.