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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use a sharp knife like an xacto, or perhaps use a rounded file. take it slow, remove some material, press-fit the bearing and if its still too tight, keep removing material. better that its too tight than too loose..