3M Respirator Bayonet Style Cap

thingiverse

This allows you to plug one side of a 3M respirator so that you can use only one cartridge, with less airflow. Print it out and then insert a 2mm thick piece of rubber cut to the inside diameter of the cap. This rubber will help the cap seal on the respirator when the cap is rotated into position. The rubber can be taken from a bike tire inner tube. You must do a respirator test afterwards to ensure it airtight. No guarantees that this will keep you safe, although for me it has worked extremely well. If you print this out post a picture or a response! Enjoy.