Summary

This is a replacement for a common mini sprayer nozzle cap. It works, not that well but it's worth it to not need to press on the stem of the sprayer if you are missing the head. It's only 2 grams of filament, might as well give it a try. This also has the added benefit of fitting under the original (usually clear protective) cap.

Dimensions:
Stem = 0.11-0.13 inches (slight step)
Overall height = 0.5 inch
Inner dia, bottom rim = 0.42 in
Outside diameter = 0.52 in

Recommend to print on the top (flat side with "mark"). I like to use brim but choose whatever setting you like. 30% infill. No supports.

The file with the "mark" is untested but a feature added if you want to see what direction you are spraying. Probably won't be an issue in terms of printing.