Yeah it's probably those little surface fragments that Marco shows above.

Try this version, here I've removed those little tiny slivery pieces, hopefully it should generate a better mesh.

I exported an STL with it with Angle = 5, and Divide larger than = 1 applied to "All" and it doesn't seem to have any problems in it anymore.

I wish I knew which particular step was getting those little tiny fragments to be produced in the first place, I'd like for that not to happen...

- Michael