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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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It's not quite as simple as running a screwdriver around the base. You need to stick the screwdriver in as shown and pry upward slightly to free the outer sphere from the base ring. You need to do this as multiple points all the way around the base. If it is still stuck, then it might be that you are over-extruding or don't have your retraction setting properly tuned.