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.
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.