I am going to say it now. Simplify3D has an absolutely #@$#@$#@ slicer.
This model slices perfectly in every single program but S3D doesn't like it.
Thanks Tails for the original, I was going to print it out but both slicing and the base the bust was on both created issues and alot of extended printing time and supports. I wiped the base completely, rotated the bust a little and repaired it properly so it now slices fine.