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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If you print the top at 10x scale (1000%) it should be printed at the same size as the base.
There is a pre-designed gap in to allow the top to slide on but if it doesn't work you can adjust the horizontal expansion setting in cura.