Corona Covid Sars Maske Respirator - no support

thingiverse

Further development of the respirator Mark-III from Locofrodo involves expanding it with valves that feature a TPU membrane for easy exhalation and reducing the inner grid to accommodate HEPA filter material sideways. In this case, the valves and soft TPU parts were glued using Uhu power transparent adhesive, which is more stable than traditional layer adhesion.