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Also had the problem with constant breakage. I modified the SCAD file provided and created a remix here:
http://www.thingiverse.com/thing:2308097 . I bulked up the area around the center bearing to ~3mm and tightened the bearing tolerances to better hold the bearings for me. Not as attractive as the original model, but hopefully can survive drops better.

Knurled Spinner Remix
by nmehta