This is a 3D printed visor for the construction of a face shield. The portion that covers the face is made from the same transparency film used for school projectors. To cut the film just use a 3-hole punch on one side, then on the other side round the corners with a pair of scissors. The sheet is held on by friction, so glue should not be necessary.
If you print these visors as a stack, I find it is much easier to file and sand the inside prior to separating them. Since these are worn for long periods, its important to make the inner surface smooth and comfortable to wear.
I found it easiest to use my flush cutters to separate the visors at the back corner. Then I can slip my scraper into the opening and pry it open a bit more. Keeping the scraper inside, I, primarily, use quick aggressive stabbing motions along the seam followed by aggressive twists. Twisting hard, but not too far. Using this methodology reduced the rate of breaking form 14 down to 2 per stack of 54.
This is a redesign of the visor made by 3DVerkstan. I made the recessed portion thicker to allow better bridging at thick layer heights, which I found particularly important for stacking. I made it thicker at the corners to reduce flex. I, also, made it three hole punch compatible while still keeping the face shield mostly straight. All these changes were meant to fix issues I was having when I printed the 3DVerkstan version, and I acknowledge that those issues may have been caused by my own error in printing.