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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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Oh, firstly I made them because I thought they were cool! ;-) You are correct, it would be nice if you could contain the blade. Someone gave me a good idea on my youtube channel. It might be hard to do it without adding bulk to the OD but I'll look at it.