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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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The type with the large knurls? The ones I used were available on Amazon but it does not look like they are anymore... I just purchased 1000 of these even smaller M3's, I'm going use those for my designs from now on.