I have been keeping my filaments for 4 years inside dry boxes made with cereal containers. They are convenient but every time I had to print outside of AMS I had to keep them open. I designed these pieces to be able to install the PTFE connectors so that if I need a color on the fly without opening and changing filament in AMS it still remains closed and does not take in humidity. Once the printing is finished, I insert the PTFE on the front connector so that it remains hermetically closed. Very comfortable for me.