I've just posted a test piece on Thingiverse :
http://www.thingiverse.com/thing:1504896
It's a very thin object, at around d 0.25mm thickness in places. The thickness isn't uniform either.
I'm interested to know if anyone is able to get a clean print of this piece, in any orientation or material, and using the minimum of support. I'm still working on it!
There's more information on the Thingiverse page, as to what the piece could be used for & how.