Face Shield Visor

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.