35:Chill designed by frog design back in the day. Radii are pretty tight.
Magis spun chair by Thomas Heatherwick:
and a few others. While the radii have to be fairly large because you are spinning molten plastic in an enclosed female mold, when you consider the scale of a chair, they still look pretty tight. You just have to make sure you place your parting lines in a way that is aesthetically pleasing and in way that facilitates popping them out of the mold.
