The Helm of the Isshurument. From the graphic novel 'Deverish Also'
This is a wearable design with a pivoting visor. I designed it to fit my lager than average head, so you will probably want to scale the files down a bit to better fir your head.
Layer height is dependent on how much finishing work you want to do. Print with 3 perimeters and 20% or more infill for strength.
If you want to print it full size, you will need to cut up the model with netfabb to fit in most printers, and play with orientation to minimize supports.
You will need to drill holes through the side of the helm and shallow holes in the visor and fit bolt for the visor to pivot. There are pilot holes in the files to use as guides.