I don't have a mask that takes these threads, but I used the same method to create the threads as my NATO set. Please leave a comment if they worked or not for you.

Threads based off third image in https://www.thingiverse.com/thing:4319462,

These are for use in other designs, its not useful to print these by themselves.

CC0 licensed, no attribution needed.

NATO version available here.

Category: Other