A few days ago, I built a ball machine element that works with both K’nex balls and marbles. The coolest part is the sorter at the end. It sorts the K’nex balls and marbles. Below is a picture and the video.
-Knextus
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knextus 
So cool Knextus! I like that the K’nex balls end up one way and the marbles another way, but that both can start out together. That will be very interesting when you add this element in to one of your grand designs. Keep up the awesome work!
Ethan and I really liked the video that showed how the sorter works.