I did a few tests to determine how comfortable the mask is when wearing it for a longer time. After 2hours there were no marks on my face, breathing was ok (yet, I could feel the air being limited due to filtration), there was a little condensation inside but the filters were still usable (not even a little moist). The rubber is important for comfort and so is the sponge band used to seal the mask to the face. Video in Romanian:
Lots of makers started building their own. You can go for plain white or add some colour, here are some ideas:
Ready to print your own #masca3d?