I am in NO way qualified to advise on any of these, but common sense says they’ve got to be better than nothing if it come to that!?
PRUSA’s Proactive approach and 3D printed face shields!
https://blog.prusaprinters.org/from-design-to-mass-3d-printing-of-medical-shields-in-three-days/
Face masks
3D print https://copper3d.com/hackthepandemic/
Sewn Masks
https://www.instructables.com/id/DIY-Cloth-Face-Mask/