I printed these https://budmen.com/ until I ran out of PLA. I don't honestly have any knowledge about their effectiveness, but while my city is under shelter-in-place it seemed as good a way as any to pass the time.
I saw a few different designs for 3D printed PPE out there - I went for this one because the materials were all things I could source and they were one of the only places I saw that would help coordinate matching you up with medical professionals that want what you've printed.
I saw a few different designs for 3D printed PPE out there - I went for this one because the materials were all things I could source and they were one of the only places I saw that would help coordinate matching you up with medical professionals that want what you've printed.