NATO-3M adapter for gas masks Daniel Nilsson

I made this adapter to let me use 3M respirator filters on my Swedish army forces M90 gas mask, also known as "Forsheda F2". But this adapter will "probably" fit any NATO threaded gas mask and will allow you to use "off the shelf" 3M filters.

This adapter is my original drawing, the design is made to be strong and extra printer friendly with no bridges or steep slopes. It is designed with just the right amount of clearance and should work fine unmodified with most printers.

I also posted the Rhino .3dm file on my thingiverse page, which allows you use the adapter threads on any other project, like for example filtering the air from your 3D printer.