Fillet problem

 From:  Michael Gibson
10508.7 In reply to 10508.6 
Hi Tony, shapes that look completely melted and smooth throughout without any distinct separate parts can often be done better in a sub-d modeling program rather than in a CAD program.

One thing you could experiment with though is cutting away some more empty space between the pieces and using the Construct > Blend command to put in a blend surface:
https://moi3d.com/4.0/docs/moi_command_reference7.htm#blend

- Michael