>> yeah filleting really doesn't seem to like the shapes you happen to be making here. I think it's a combination of bending plus that twisting effect I was talking about earlier.

Yes but that applies to the green model too but on it everything works better. I am just wondering what is special of the green curves that I used to loft the green model :-) If we figure that out won't that help?


Regarding your uploaded file, if I select the entire model I can apply a fillet of as high as 8...17 units on it. If I select any of the curves on their own, fillet completely fails (8 or 17). Plus the surface quality of the fillet in the corner seems not nice in reflections.
Ok no problem. Thanks for helping though.