Here is another example. You can see that there are several 'parts' which do not come together in any way. There forms are dictated by their functions. But all these 'parts' have to come together to make one part. As I said, the problem here is nothing like a 'fillet', although the end result often looks like a 'fillet'. This sort of a problem comes up in my work more often than the 'fillet' problem. And when confronted with something like this, the question is: How do I make these 'parts' conform to one another. Let me be perfectly frank and say that I can very seldom see how this should work. So I need a method, like an algorithm that let's me me begin in the dark and slowly come to the light. In this example, I began by making the surface in the center, which goes from a flat plane on top to an ellipse at the bottom. I used 'Blend' to make that -- but first I had to extrude the ellipse at a certain angle that would give me the correct form. With that surface done, as you see here, I went about "drawing" lines on the surfaces of the other parts. The blue lines shown here are not the first or the last that I drew. I draw some lines, and then rotate the view around and look at the whole scene from different angles. My first effort is usually quite poor, but knowing what won't work is information leading to the solution. I keep refining these rough lines until I can 'see' how the connecting surfaces must be. When I finally know what I'm doing, I apply the method that I previously explained, to go from these roughly drawn lines to fair curves that lie on the surfaces. With these I trim the surfaces. Then I use 'Blend' and 'Network' to fill in the gaps. 'Network' is a fantastic tool, but you have to provide enough information for it to work without deformities. 'Blend' is the primary tool that you use to set up the network of curves (the information) that 'Network' needs. When you master this, the results are wonderful.