I needed clean air connection adapter for 6800 full face gas mask, but I did not find any useful ready models. Female connector is made two pieces for easier printing. Male connector is just for reference. Cover is glued in place. Piece of dust filter can be fitted inside adapter if needed.
Glue top cover in place and test air tightness by blocking feed hole and blowing in adapter mount hole. Insert pad on air filter material inside adapter. Fit connector in feed hole or glue feeding hose directly to hole.