Better Solution with Silicagel:

https://www.printables.com/model/413311-filament-cap-for-ptfe-tubes-with-silicagel-contain

or

https://www.printables.com/model/72934-m6-m10-dry-box-sealed-passthrough-screw

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When I made my first dryboxes I didnt find any nice filament cap for them. So I designed the tiny version :P Very minimalistic!

But over time I did not like how fiddly it was to mount them to the tube. So I created this bigger version.

It is better to grip, holds tight to the tube and if you put the filament inside with a little amount of force it should hold the filament too. But that is not necessary. I designed the cap intentionally with more material so the filament will stay dry this time!

I recommend to print the caps with the fitting color. So it is more easy to choose the right one if you use unclear tubes.

If you are building your drybox you may also want to use these passtrhoughs I designed:

https://www.prusaprinters.org/prints/72934-m10-dry-box-sealed-passthrough-screw

In addition to the caps I designed a very simple holder for the tubes to make the whole system more organized. If you need a remix of the holder please describe your wishes in the comment section.

Print with 100% infill 👍

Have fun and keep printin!

PS:

Some credits to https://www.prusaprinters.org/prints/2940-ptfe-tube-cap-with-filament-catch

While looking for an alternative solution to my small cap, I came across Wilko's version. Unfortunately, I don't find his design really appealing, so I didn't download it =) But if functionality is enough for you, his design is cheaper and faster to print.