Hi Andrei, is it possible for you to post the 3DM file of this so I can test with it over here?

I've been working on Blend for a while now to make it possible to select more than one edge on each side of the blend instead of only doing one single edge on each side at a time.

It should help with things like what you're showing here, since having more of the blend constructed in one single operation can avoid problems related to building them only one little piece at a time.

This would be a good test case for me to see if it's working to solve this particular problem or not yet.

But it needs some conditions to work well also, like in order to make a good large blend the edges need to be smooth to one another and the surfaces should not be too different in shape right at juncture points between different edge segments. That's why I'm not 100% sure if it will solve this particular case or not.

- Michael