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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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I've used Dan Kirshner's OpenSCAD threads module with good results for both imperial and metric threads. It's really compact and easy to use:
https://www.thingiverse.com/thing:1938150
http://dkprojects.net/openscad-threads/

OpenSCAD threads module