Can't import STL

I've been trying to import this STL: http://www.thingiverse.com/download:1986364 to make a minor change but it just churns for a while and then an error message pops up for maybe 500 milliseconds and goes away.  The STL imports fine in MeshMixer and Cura, shows no errors, and prints fine.  I've even tried cutting it into smaller sections with Freecad and even the sections won't import into Tinkercad.  What could be causing the problem?  


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