Hi Rudy, I'm not really sure why that one is limited to such a small radius, it looks like it should work at the radius that you were trying.

Looks like probably a bug in filleting.

One way you can work around the problem in this case is to use surface/surface filleting rather than the regular edge-based filleting.

Surface/surface filleting is where you have selected 2 individual surfaces and then run the Fillet command. It tries to produce a fillet more directly off of 2 surfaces rather than trying to follow edges which the normal one does.

Following edges tends to be more complicated and sometimes when the edge-based filleter has a problem the surface/surface filleter may be able to do it ok.

So for example in this case, take your "Band cannot fillet" object, and use Edit/Separate to break it into individual surfaces. Now select the 2 surfaces like this:




and run Fillet and then you can produce a fillet there of a larger radius, for examle 0.5:



It seems that it has some problems trimming at certain radius values even with surface/surface filleting, but there are a lot more values that work with this method.

- Michael