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.
What orientation did you use to print it? I normally print it with the flat part of the fan mounts and cross-brace down against the bed, in that orientation the small rails that are screwed to the base are at a 45 degree angle. I have found that in general, prints are brittle if they are printed at too low a temperature, I always print a temperature tower after any major changes or when I try a new filament, and use the coolest temperature that is not brittle.