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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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I haven't tried the 10cm version but the 8cm just doesn't work. The ring just doesn't work because the outer lip that's supposed to slip into the loops just isn't thick/long enough. It's so thin that it's hard to print properly in the first place and once you've put (a smaller) spring behind the button, it applies pressure to the ring and the outer lip is too short to secure it firmly into the recessed areas on the loops.
I tried multiple times but I think I might just find an alternate design until the designer fixes this one.