A while back I was bummed that I took the easy way out and made these little endcaps for marble tracks (screenshot) individual pieces instead of having a toggle or even automatism. But now I am happy I went the lazy route cause I just had the idea for a bumper endcap, making marbles bounce back.
One of the few times in my life where laziness gets rewarded. :D

One of the few times in my life where laziness gets rewarded. :D

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