Check out “Hardcore Ruby” nozzles, now there are even diamond nozzles.
I print with 0.25mm nozzle in nylon, fine enough for Module=1.5 teeth.
A 0.15mm nozzle would make an acceptable Module=1 gear I would guess.
I actually print with a 1.2mm nozzle as I want to print big parts. I’ve even got the e3d Supervolcano hot end. :)