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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'm glad you find it useful - it's one of the most useful things I've designed. Yes, the blade holder snap fit is pretty tight. I think I just used my usual 20% infill and 3 perimeters. Inserting the blade holder from the side there the pivot boss is tapered helps get it wedged into place.