I used the face of Goblin Junk Merchant Bust by dutchmogul, and cut out the back to make a mask. I printed this on the Replicator Z18. I plan to add paint for another level of scariness.
This used just under 1kg of filament.
I uploaded the goblin file, and used a scan of my face to shape the back, then I proceeded to hollow out more of the back to use less material and allow for easier breathing.