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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Have you considered changing the cap to a screw cap instead of the press kind? You won't have to superglue the end then.

I've recently started remixing designs, but I haven't reached the skill level to design screw threading yet. If no one else gets around it, I might eventually attempt it myself.