This is a simple air quick-connector to 1/4" hose barb adapter I threw together in FreeCAD for my vacuum chamber. The aspirator pump I use to draw a rough vacuum is a bit unwieldy, so I decided to try this kind of connector.
There are some adapters out there on Thingiverse already, but they are multiple parts requiring supergluing. I figured I could do better.
I did not design this with compressed air in mind, it is only intended to be used for vacuum pressure systems. THIS WILL PROBABLY EXPLODE GIVEN ENOUGH PRESSURE, USE WITH COMPRESSED AIR AT YOUR OWN RISK.
Print with a brim, with the hose barb side pointing down and the pneumatic quick connect side pointing up.