A flat rendition of Iron Man's mask from the Avengers. I do not own any of the associated copyrights, trademarks, etc., nor do I claim to.
Feel free to modify however you like, but some credit would be appreciated.
You will almost certainly need supports, as the middle layer is suspended in midair.
I created this in TinkerCAD by importing an .svg of the mask, and adding in a flat center layer so that it could be printed in a single piece.