3D printable and reusable face mask that can be used with improvised filters or comercial filters with a rd40x1/7" EN 148-1 thread used in europe, also can be modified easily with just one printable component so it can use other gas mask filters. It can be desinfected and altered to fit each individual, cheap, simple, and working., yet rugged and safe.As of this crisis, this model is entirely free, the point is to survive this, not to get rich, so download it, try it, use it.And if you want to suport my work you can vith a humble donaton on paypal : https://paypal.me/masinac?locale.x=en_US