I'm using Armind3dp's Filament Dry Box for storage (https://www.printables.com/de/model/185335-filament-trockenbox-filament-dry-box/comments/756720).
These end caps fit onto 4mm PTFE tubes to seal off those filaments currently not in use. The filament can extend about 1cm from the tube with this, for easier access on next use.
Printed in TPU at 0,2mm height
The author marked this model as their own original creation.