Edit 4/28/2017 :  I printed it out at 100% and it was a little small for my head.  I would recommend printing it out at about 110%  but I'm 6'5" tall so my head might be a little bigger than some.
I had a couple of requests to make a Deathstroke mask with two eyes.  Well here it is...enjoy
This mask was sized to fit an adult male but but do size accordingly.
I will not make one with three eyes so don't ask :)

Thanks Uncle Jessy:
https://youtu.be/wiotQ0M422g
This is the Deathstroke mask from Arkham Origins.  In this remix I added strap holes to the mask and the back piece.
This mask was sized for an adult male.  It is 10% larger than the orginal.
Note : If you printed the my original Deathstroke mask this back piece will fit it.  You will just need to scale this back piece down 10% from what you printed the original.  So if you printed the original at 100% the back piece will need to be printed at 90% to be at the same scale.