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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You've got some good points, I was actually thinking the same thing about the inner circle diameter when I was assembling it!
It's a really good design and has been extruding really well for me, with couple of improvements it could be even better!