I have an empty hole in my surface that I'm trying to get a blended fillet in. I'm having difficulty because when I try to use a boundary surface the result leaves visible seams. I tried using surface fill but it just didn't work.
I just did a quick model
You can play around with the ends to make the patch smoother and also add guides on both sides
When you created your Boundary, did you assign connectors (optional)? This might make the difference between it working and not.
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