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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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Both the 40mm and 20mm worked great with my Series E 50mm lens! I cut the aperture lug off so I could use stop-down metering and have depth of field preview options. I've always wanted a set of extension tubes!
Thanks!