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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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Thanks, please post a make too!
i can send you a step but one good tip for stl-step conversions is to use Freecad, it has saved me many times where inventor cannot make a conversion.
I have Lee press but this case feeder is not installed on it. We use these 3D-printed case feeders for our automatic case sorter that can sort brass by headstamp: https://www.instagram.com/p/BxXrJLMn00C/