This is an adequately close model of Magneto/Shaw's helmet from x-men first class. Total print time is about 25hrs.
Designed for a 7.5" head width. In hindsight it is a bit too big, and I would scale it by 7/7.5 if I were doing it again.
The first one was printed on a Fablicator.
Use something to cut up the Solidworks or .stl file into printable pieces for your printer.
There are just too many different ways to cut it up for different printers so I left it whole. It is just better if you do it yourself to optimize your ease of printing.
You pretty much have to use PLA. The pieces are to large and thin to use ABS without the 70C heated chamber that almost nobody has yet.
Once printed, I used a soldering iron to CAREFULLY melt the pieces together.
I used a liberal amount of bondo, elbow grease, and sandpaper to make the helmet smooth. The paint used similar to duplicolor metalcast over a black base coat. Bondo, primer, and wet-sanding are your friends; Patience is a virtue.