A small piece of filament is used as the pin for the hinges. Once it’s in place heat the ends of the filament and press them flat to make a rivet that will stay in place. I like to hot glue elastic at eyebrow height to make the strap and i use a small piece on the jaw to help keep the mouth closed.
This mask can be used with an all black face cover if you want to hide your face completely. A black T-shirt can be worn, cornholio style to cover your hair and neck like in my photos.
I print these with the flattest side down against the print bed. Use supports and a brim to keep things strong while printing. I've included the full pieces as well as cut pieces to print in smaller chunks.