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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 have the 3mm shaft in there, but I have noticed the screws for the side cover loosening and I've had to re-tighten them. I'll print another gearbox tonight and glue that down as well as put a washer on there, and see if it solves my problem. Thanks! I'll let you know my results.