This is a fixed file for HAILTOME's Protoss Pylon "https://www.thingiverse.com/thing:1710513". I wasn't able to remix it so I thought I would just post the fixed file. The only thing I did was fix the file, I didn't change anything else.

Edit: I found a much better and easier way to fix these things. I installed 3d Builder on Windows and when I import the model it says there are some invalid things and you can click on it to fix it. Click on it and it will repair the file. Save as an stl.