This is a Presta valve cap with proper #10 24tpi threading to fit the valve better than other models out there. it included a filleted square hole for removing the valve core on Presta valves.
I find Presta valve tools to be small, and easily lost. so I figured it would be best to have one near the valve and ready to be used.
use whatever filament you like, and print it solid. it's a small enough model there's really no reason not to.
print with the thread side facing up
The author marked this model as their own original creation.