-less parts, simple and elegant design.
All the parts are made of ABS plastic material. (except screws of course)
Visible ones are going to be polished with plastic polish. And their material will be more glossy ABS.
Column can be stainless steel but i prefer ABS again there.
Vent going to be resistant, all the parts are supported with eachothers and yacht body.
Built with easy manufacturable parts and materials.
In addition materials are cheap and nicelooking and also easy to clean.
Designed to keep the dirts away from inside.
Has a smooth operatable rotate button which rotates the wings, with a nice looking and understandable indicator.
(Materials has a lot of alternatives. Plastics is a wide world.)
Good luck to other participants
http://grabcad.com/library/human-hand-dot-sldprt is from 493a44bb
Mentioned in an article by John Evans