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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 easiest thing to do is to use only two bearings on each rod journal and then you washers to space them away from the printed parts. The height of each part can vary +/- .2mm or so, depending on first layer and the slicer so that can add up once you put everything together.