Here you go.

Hi Involute, I tested it with a fillet of 0.05 units and it's working fine for me over here, 3DM file is attached. You do have to make sure to select the entire sequence of edges though, there are also 3 edges in these areas:



0.05 is about all that will fit, much larger and it will run out of room here:



- Michael

Hi Involute, I don't know if this is important or not but also note that the fillet will eat away some material underneath the other solid disk shape here:



- Michael

Aah, I didn't realize I had to select all the edges. Works for me now, too. Thanks.

> the fillet will eat away some material underneath the other solid disk shape here:

Thanks for pointing that out. Fortunately it won't matter in my application.