I really like the design, so I felt bad that no one commented on it yet. Printed it twice, once at a hundred percent, which was too small to fit my rather big face. Printed it again at 117% and it fits great.
My only complaint is that the thread is not the same on both sides. Had to print the filter parts 4 times. Because I printed it wrong the first time and the second time I screwed it too tight and wasn't able open it without breaking.