This is a combination schrader valve cap and rapid deflator. It functions as a normal inner tube cap, then unscrew and spin it around, and use it to deflate the tube.
This was originally intended for use with a free diving float tube. After the dive it's a pain to have to sit there with a screwdriver to deflate it, and this solution is "safer" than unscrewing the valve itself.

I printed this with ABS, but PLA should work fine as well.

Be careful when first screwing it onto the tube, it's VERY easy to cross thread. When it's right, it'll feel right.

I had best success when printing with a raft. When I printed without a raft, the bulging first layer made it hard to get the initial "bite" of the threads correct on the tube.

The OpenSCAD file is included.

Big thanks to Dan Kirshner's thread library https://www.thingiverse.com/thing:1938150

===July 20 update===
Added a bit more solid area between the two caps

Creality

Ender 3 Pro

Yes