This model is what I would want to see on RC4. It is a revised version of face shield RC3 from Prusa based on the feedback I received from several doctors. Additional features are as follows:
-Slightly inclined front plate to cover splashes from under better(10°).
-Wider shield for better protection from sides.
-Shorter shield downwards for better movement.
-No need for bottom reinforce.

Sorry for removed Prusa writings but I had to for the new extensions.

Edit: It is now ready to be produced. Proper dxf and dwg files for the front plate are added. It is not compatible with the original shield. I used laser cut 0.5mm PC sheets for front plate but PET sheets would be fine as well. I am also planning to add 4 stacked model and one with closed top.

Edit: Closed top model added. Beware that closing it even in the simplest way like this cause a 25% increase in print time.