Covid-19 Mask (DIY Respirator) - Easy to breathe

pinshape

Human: 2 pieces only (plus an optional head strap for the rubber band) 3 hour print time (Prusa i3, PETG, 0.3mm layer, 20% infill, 3 perimeters!) Requires some form of a gasket on the inside edge for a good seal. Window seal works great. Silicone bead does too. Model contains a small ridge for easier alignment of the seal. 0.5 to 1 mm filter thickness - designed to be used with cloth, nano fabric or other types of thin filter materials. The filter needs to be roughly cut to size. Snap-on filter cover holds it in place and creates a reasonable seal around the perimeter. UPDATE 9/4/2020: Added a thin-wall version of the facepiece (still fits the same filter caps). 1.2 mm uniform thickness of the wall yields 3 perimeters on printer with 0.3 mm nozzle. Reduced print time (to 2 hrs), material cost and weight. Durability in PET-G seems sufficient. UPDATE 7/4/2020: A second option for the filter cover designed for a round (57 mm diameter) foam cosmetic pad as a filter. The pad circumference needs to be pushed into the groove to fit and create a sufficient seal. A third option added per suggestion from Mr. Calin Caparu - An alternative facepiece without a filter cover. Fabric- or paper-based filter is wrapped around at least 1 cm and secured to the mask via rubber band, which should be tight in the corresponding groove around the air intake. Apparent pros: Single piece, no worry of losing the cover, no possibility of bad fit between the facepiece and the filter cover due to different printing margins. Apparent cons: Needs a suitable rubber band, requires a larger piece of the filter. This is my take on the facemask. There are plenty of other models on Thingiverse and around the internet, but I usually had issues with: Long print time Too much bulk and most importantly Very hard to breathe with a good seal!! Full disclaimer: THIS IS NOT TESTED FOR PROTECTION! The protection certainly varies depending on the filter used. The main purpose of this mask is a disposable mask replacement that is relatively convenient to wear and breathe in for a longer period of time. Let me know if you need a modified size! I can also model in accommodation for glasses if needed. My glasses work with this mask fine. Stay safe!