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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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Yea, I ran my X-acto knife in that groove all the way around several times. I never really heard anything breaking loose. It won't even budge when trying to turn it. I just don't know. I did print at .15, with a .04 nozzle. Perhaps that made a difference. I printed on an Ultimaker 2+ which I get very precise prints. Oh well.