Summary

This mask is a model, do not use it, if you use it, at own risk. This is not a legal filtered mask. It is only a prototype for my own development.
Remember if your body gets no fresh air you die!!!!
This device is to learn how a mask works only.

It has two valves one for the air to in flow and one for the used air to out flow.

On the in flow valves there could go a filter with a Rd 40 size(NATO Filter).
This mask is not airsealed, 3D Printer are always have space between the layers so to make it better you should close the gaps with filler or and paint.
to make the mask more air tight you should use window seals around your face side

Part P0178-4-4
and P0178-4-5 has to Printed two times

First und don't have to use the P0178-4-5 and look how it works but if you want your mask to be more air tight use it. it will hold the opening closed until you breath. bend it so the valves are closed but not to hard so you can always breath.
Part P0178-4-5 has to manipulate: ripped of the middle to bend it, i used a lighter to warm it up and then bend it.

more later cu
take care