Thanks again manz,

I got your example to work.

This was my original approach, except I was using just a single curve outline of my wave, extrude, then fillet. Fillet would fail due to the sharp point. I believe this is the issue Michael has illustrated a few times where the fillet diameter is bunching up and folding back on itself going around a tight turn.

So, it seems if multiple curves are used then larger fillet diameters work and they blend nicely where they overlap.

Very good. And, I learned a lot from using the network approach as well.

Ed