Hi jetblast, often times the fillet engine that MoI uses has difficulty with "disappearing fillets" where a fillet runs along an area where surfaces become tangent to one another like in your case there.
So I think probably you won't be able to do that fillet in MoI directly.
If you use Edit > Separate on the 2 surfaces there to break them into individual surfaces, you can then select the 2 surfaces and do a surface/surface fillet to generate a fillet segment like this:
That may give you something to work with and then you'd need to do some manual modeling to fill in the end parts.
The easiest thing would be to try importing the model into ViaCAD, it has a fillet engine that can handle those "disappearing fillet" cases a lot better.
- Michael
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