Fillet edge after BooleanDifference fails on some edges, on other not.
Sample file: Naked edges after boolean fillet.3dm(763.5 KB)
Use SrfSeam on the srfs that add an extra edge to the corner spots as shown.
Then make your tolerance tighter for this file and it works. I’ll file this case for development to see if we can handle this situation too though. Thanks for the sample file!
Thank you Brian, I rotated each cone for 45 ° then boolean, fillet and works great with the same tolerance!