Nato Mask Altitude Training Adaptor

So not a lot of people out there are as "crazy" as me to go running with a full face mask. I found that the mask with standard filter may be a bit much, and without just not enough. And I figured I am not going to buy one of those altitude masks. So I designed this "altitude" vent using https://www.thingiverse.com/thing:3312797 and https://www.thingiverse.com/thing:3875269.

I printed mine in PETG 15% infill.

I made the design so that the hole can not be completely closed, dont want it to cause suffocation.

I do NOT accept any responsibility for anyone using or misusing this or ending up in a bad spot over this. You use this at your own risk!