This is a Halo 4 Air Assault Style Helmet with split apart pieces to print on an 8"x7"x6" print bed.
This model was taken from the following 405th.com pepakura armory files:
Modeler: Satchmo III
These people are awesome when it comes to unfolding and modeling.
I just dressed it up and made the models printable for the 3D printer. You can print the helmet. It may require some fine tuning.
I have not printed it yet but it shows successful through simplify 3D so enjoy.
WARNING - You may want to resize this to fit you as it currently is set to fit my fat head.