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Thanks for looking into this.
I downloaded the new file (Time stamped 3:00 today). There is no longer a gap in the end of the fin.
Edit: the following does not happen when my advanced settings use 50% Minimum printing thickness in the advanced tab (but there is something funky going on with the tail curves. I was only able to save the image as a PNG file (called New_error). - Again, this no longer happens, I have left this text in case someone else gets this in error so they can correct it)
Yesterday I had used 3DBuilder (Microsoft) to correct the STL and it was working with S3D. I have attached that file for you to check.