Here we have a group of people 3D printing parts for the visors, they’re using special plastics that can go through the autoclave & are resistant to disinfection with nasties like hydrogen peroxide & they are built to an approved pattern where a simple sheet of acetate with holes punched in it simply clips to the frame and the acetate can be washed etc but simply replaced too.
So, the NHS simply bin them after a single use & come asking for another 500 the next day.