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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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Pleased to hear your Revolver parts are printing well. The notch is not necessary at all but can help when solving the puzzle... you may find progressively keeping layers aligned. Fixing to a point seems to help some people solve the puzzle...

Good luck!