1-way valve for DAR filters

thingiverse

This is a design for a one-way valve that can be paired with a medical filter to prevent airflow from the mask flowing back into the filter. It makes breathing in Decathlon-like masks more comfortable. There are files available for two types of membranes: * Decathlon: This model uses the same valve membrane as the Decathlon mask, which is also sold separately by Decathlon as a repair kit. * 3M: This version utilizes the 3M 6889 membrane, a replacement part for the 3M 6000 series masks. Each type of membrane has two versions of the membrane holder thickness: * Normal: 10mm * Short: 8mm To assemble the complete valve, you'll need parts 'a' and 'b', as well as a valve membrane. For the 3M versions, you can create your own membrane using silicone casting with this mold: https://www.thingiverse.com/thing:4389047. I recommend using the 10mm version for optimal performance, but if you're looking to save filament, the 8mm version should also be acceptable.