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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I had made a mistake and uploaded the copy of an other part as the shank version 02. Now I've updated that file with the correct part data. I think that is your missing part. It will connect bell bow to the body up, it will also support the mouthpiece. Thanks for pointing out the mistake.