STL import glitch

I'm importing the STL from this thingiverse file.  https://www.thingiverse.com/thing:3863549  The file opens properly in Slic3r and prints correctly, but when I import the STL into tinkercad (I want to modify it slightly)  it has these jagged glitches in parts of the corners.  I have tried exporting a new STL from Slic3r with the same results. 


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