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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 don't think it matters. I've seen the hairspring mounted both ways in videos on youtube and the thing still runs. Check this out:

https://www.youtube.com/watch?v=-8bA28BdoV8

As opposed to LarkysPrints video.