According to the information which i obtained from my two tests;

Connector Calibration Test:

Wall Thickness Test:

I created this simple and modular hexagonal container. After printing it, for the first times you need to open and close the cap for many times for a little calibration. You can feel the air vacuum effect that comes from perfectly fitted parts. You can stack them as if they were a bee hive by adding two caps both top and bottom which in turn allows you to save more space.