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

thingiverse

**2 pieces only** (plus an optional head strap for the rubber band) **3 hour print time (2.5hr for thin-wall version)** (Prusa i3, PETG, 0.3mm layer, 20% infill, 3 perimeters!) Requires some form of a gasket on the inside edge for a good seal. The adhesive window seal works great. Silicone bead does too. The 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 facemask (still fits the same filter caps). 1.2 mm uniform thickness of the wall yields 3 perimeters on a printer with 0.3mm 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. 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. Needs a suitable rubber band, requires a larger piece of the filter. **UPDATE 15/6/2020:** Per request update: Added version of the facepiece without the seal ridge. --------- 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!