Covid mask remix with exhalation valve

thingiverse

Remixed mask (https://www.thingiverse.com/thing:4225667) with exhalation valve and possibility of using another filter. Membrane made from inflatable balloon glued on raised part in middle of valve part. Possibility of using thinner filter thanks to frame filter holder. Supports only for valve part. !!!!!!BUT who has a printed original mask without valve can add this valve!!!!! https://www.thingiverse.com/thing:4239168 It is much comfier and works better because membrane is bigger. 04/05/2020 Added some new cap designs. 04/07/2020 Added small "o ring" to make better sealing between rubber and valve surface. Glue air leak stopper with surface that was on heatbed towards rubber. Use thick glue (silicone, epox, montage glue). Softer rubber works better. I use rubber from gloves now. When testing for leaks, remember if inhaling too strongly, soft rubber will deform and get under ring - this will cause leaking but in normal use it will work well.