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.
Dang, that doesn't sound good. I followed the instructions here: https://www.thingiverse.com/thing:3188888 for installation.
Another option to get it installed would be to heat up the handle of the blade a little bit then press it into the printed part. Or maybe safer, just put a heat gun to the notch on the printed part so it gets soft enough to press the blade into. In both cases be sure to avoid heating too much.