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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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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.