PETG, PLA. Print , then remove thin walls at nose curve. cut exhaust tube if needed. assmble with screws For good obturation turn base ring with filter fabric, so it allignes to your fase tightly. Then plase fabric over mask basket fix it with fixing ring, outer side of filter turn over basket apply base rint and assemble with screws. Valve is made of come thin resin, latex glove os smth. like. Lay it over exhaust tube and fix with screws. test exhaust it must be light.