Pyromancer's Mask, TF2 (Team Fortress 2)

thingiverse

This is a modified mesh from TF2 with minor edits to make it printable. To achieve real size prints, use a scale of approximately 2100-2150%. My print was done at 2150%, but I have a relatively large head measuring about 63cm in diameter. The mask comes pre-sliced into four parts or can be printed as one solid piece if you have access to a sufficiently large printer. Unfortunately, there is no provision for a strap, but it's likely that you could easily design and print one using Tinkercad.