During 2020 and the madness that came with it, 3D printing has heled many people. There have been countless 3D printed face masks, like the image on the left.
Here are some links to websites with 3D printed masks:
3D Printed Masks and Face Shields
3D Printing of Medical Devices, Accessories,and Components
3D Printed N95 Replacement Mask
While hospitals were overwhelmed by the amount of patients with the corona virus, respirators were in short supply. Many People 3D printed pieces for working respirators.
Here are some links to websites with 3D printed masks:
Lessons from the field - 3D Printed Respirators
COVID Respirators - Intermountain 3D - 3D design
UB-led team developing 3D-printed, reusable N95-like