A balloon valve which only lets air through one way.
Probably known by many, i wanted to try and model one myself.

Will only work with specific materials which have to be air-tight (kind of)
I tried with ABS but it didn't seal properly. I may have to change a few Things in the model.

If you're going to print it, (print in place) i'd be happy to hear some feedback.

Stratasys

Dimension SST 1200es

No

Yes

200

20