You’ll find yourself watching the gentle fall of balls for hours on the Phi.L. Great Ball Contraption module Pont à Bascule. This module features a ball conveyor and several rotating arms that are held vertical by gravity. When your favorite soccer balls and basketballs reach the top of this ball machine, they cause the different rotating arms to swing one after the other. The arms quickly snap back into place with counterweights, in perfect timing to accommodate the next ball. You can reproduce this compact and fun GBC module with the free building instructions proposed by Phi.L and available on Planet GBC.
Original design by: Phi.L
Number of parts: 533
Complexity for building: 
Price for Building: €€, affordable
Pont a Bascule, on Phi.L YouTube channel
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I built this not to long ago. I strengthened the frame to make it a lot stiffer.After adjusting a bit, it worked very well.