Hi OSTexo,

> I do think you are running into issues a bit because of your control point placement,
> you might want to bump it up a bit and readjust some of the points so the blended surfaces don't start folding over themselves.

Thanks for this suggestion and i hope to build a new version of the chair made by better relaxed and smoothed source curves.

Could you please post the .3dm file of your version of the chair ?
Just in order to have a good starting point...

Thanks for all and have nice day,

Marco.