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MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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After judicious use of very, very slender knives to pry and shave the gaps slightly larger and smoother, I can now wiggle the loops. I expect full rotation will be possible with more work. Unless it is dissolvable supports, I would not recommend 60% scale PLA print on a printer similar to mine. The gears were barely not fused together. I would bet that full scale would be fine though.

I expect it to be quite popular once fully operational with the kids, they love fiddling with tactile things, and if I can slip in some math and geometry while they're interested, it's totally worth it.