Waste of time and resources. Consumer 3d-printers, and most commercial 3d printers, do not have the tolerances to print effective face masks that keep out dust, much less smaller particles like viruses or bacteria.
You clearly haven't even opened the article, let alone read it. It's about face shields, not respirators.
Yeah, that was my bad. I skimmed through and after I saw the face masks (pre shield) I assumed it was like the post from last week where they were trying to print respirators, not face shields.