Nicely done - thanks. I’ve been using the fillet routine for many of my 3D printed parts, but in tricky situations I used BrepEdges and CherryPicker to identify the desired edges to tweak. The method you showed in this video is much better - so thanks for that. I would suggest you consider adding a video about the CCEdge function - in many cases I’ve found that works perfectly for geometry with concave and/or convex edges.
I think it’s also worth noting that the Fillet function likes to be given Closed Breps. I’ve had cases where it will work with trimmed sufaces, but these don’t export properly as STL files for 3D printing.