Uniform fillet

 From:  ulisses
11854.1 
Hello,

I'm trying to apply a fillet to this object, but the result isn’t what I expect.
Here is the object before the fillet, with the edges selected:



After applying the fillet, the offset/distance becomes uneven along the curve:


Any tips on how to get a uniform, consistent fillet along the whole surface?

Tks,
Ulisses