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.
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!