Nắp đậy kín cho ống PTFE

A sealing cap for filament dry box. I found the version that goth2k had made and found that if the PTFE tube was angled downwards, the sealing cap would fall off due to gravity. This version has a small incline in the space where PTFE tube goes in, making it stay securely in place regardless of orientation. 

The cap itself seals off the PTFE tube when not printing, allowing the filament to stay in the tube without risk of moisture getting into the filament dry box. Furthermore it makes it possible to keep the filament dry box shut as much as possible, as the filament can be extracted for use, simply by removing the cap. 

It fits 4mm PTFE tubes and 1.75mm filaments.