April 10, 2020
Description
Protective mask with optional backflow valves. These valves allow to control air flow direction through the filters. Air is inhaled through one filter, exhaled through the other one. This solution extends input filter lifespan because the filter does not degrade by moisture in exhaled air.
I recommend to print sealing rings and valves using TPE or similar flexible material. Rest of the mask can be printed using PLA, PETG, ABS, ...
I also recommend to apply some window/door sealing to the inner side of the mask so it can be as tight around face as possible.
Mask is a modified version 1 of https://www.thingiverse.com/thing:4225667
License:
Creative Commons - Attribution
83tyfus
