My metal valve wrench didn't have the exact dimensions I needed for one of my airbrushes, so I designed this tiny wrench in a pinch.

Took a few attempts, and a ridiculous amount of chamfers, but this worked printed in PLA with a 0.6mm nozzle and didn't break after several uses, even without the best print quality.

I can't promise it will also work for you, but I include the Fusion 360 file as well in case you want to make any changes.