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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.