Wavy BlendSrf result

Not sure why the result has to be this wavy…

blend-wavy.3dm (242.4 KB)

Also, that blue surface is extruded from a curve, and when I extend that back this happens to the blend:

Not very happy with the blend surface tool right now.

History is for fast design iteration, and Rhino fights you at every single turn when you try to use it!

Hello -

I see this… I’ll see if we can make that work better.

As for the wavy, my guess is that the structure expands with the distance between the edges - this is a Sweep2 under the hood. If you set up yor blend like so

the wave is minimal or gone.