Maybe you've already posted this in one of the #443 posts, I haven't had time to make my way through them all yet, but I think it'd be really interesting if you could post the dimensions of your cardboard circles (length x width, we can round the edges ourselves), and the spacing between each cardboard circle. That way others could duplicate it on their Metros and test for similar results, and maybe even make a permanent version to keep on their Metro.
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