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.
Very cool to see, I think you are using PLA for the nuts? this would give it some shrinkage that needs to be compensated by horizontal expansion. When I printed the nuts in PETG it didn't need horizontal expansion because it only shrinks a tiny bit. Also printing at low layer height of 0.1mm or 0.15mm can get much better threads than higher layer heights.