User blog comment:Zimkiller1/we don't have to reuse an already existing mask for fan masks/@comment-2026417-20150107195543

Molding plastic is not a really easy thing to do. Making molds, melting plastic to the right temperature, mixing them, and then pouring them into the mold is not a simple process. There's a lot involved. And that's not even counting possible fumes that could get involve if you end up boiling the plastic, and since you won't have a uniform color, you're going to have to paint it as well.