Here is a group making PPEs by combining the powers of 3d printing and laser cutting. They need laser cutters to help complete these parts! Pitch in if you can!: (using .5mm PETG)
3dforcovid.com - glowforge settings included on the site!
There are also single process mask designs out there (also using .5mm PETG) that can be made to work without any 3d printing:
A large collective has been assembled of all types of makers making all types of devices at the following link:
If you can help, please sign up!
Also, if you are in the carolinas, we have a small group here dedicated to local needs as well: