Half mask

thingiverse

Size L fits most men, size S should fit most women and children over 14 years old. Parts of the valve start with V, parts of the filter assembly start with F, and the second letter indicates the type of filter (see photo): F for round filters and S for pear-shaped ones. Printable with minimal supports, use a valve membrane as a template to cut out from silicone or stiff foil. I designed the parts so they require minimal support. Support is needed on the sleeve, locks, masks themselves, and everything else should be printed without supports, lying flat. I printed with a 0.5mm nozzle at 0.16 and 0.2 layer heights. Two perimeter walls are sufficient due to the stiffness of the parts, which have not broken yet. One full mask takes about 24 hours to print, spread across different lots of parts. The parts are uploaded in OBJ format for easy editing and processing by most slicers. If you want to skip the F rim and F grille, you can do so since they protect the filter but are not structurally necessary. If you have a different filter, I made this design modular. You only need to design the filter enclosure (F rim, F grille, and F lock) and possibly adjust the F screw. After printing, glue the F rim and F grille together. Glue the F Screw and F backplate and F lock together, checking positioning first. If you want an adjustable filter enclosure, add 2mm of silicone to the F sleeve before gluing it in place. Insert the valve mani part into the shield and glue it to the mask once positioned correctly. Add foam around the edges for comfort and a better fit. Add a clothes band with adjustment slots and a tiny screw to secure the backplate, and you're done! Usage: I've made 18 masks so far, and most of them fit comfortably. If not, you can redesign or heat and bend them to fit. Remember to not touch your face when putting it on and spray the outside with alcohol after use. As for filters, FFP3 is the best option at 100% filtration, followed by FFP2 at 95%, and FFP1 at 80%.