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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 had the same problem, it has something to do with the plasic curling up as it prints, the bottom, overhanging, part of the wheel ends up being less round. My remedy for this was to split the wheel into two halves and then add screw holes so I can screw the two halves together.