Gear Collection 1

Spur Gear Collection 1
Module - 10 mm
Pressure Angle - 20 deg
Teeth - 10 to 50 (Total 41 gears)
Gear face width - 15mm
Shaft hub size - 20 mm default.
If gear stl file name is Spur_Gear_10M_10T.stl then the gear has 10 teeth with module 10

Spur gear Collection 2 - https://www.thingiverse.com/thing:2817682
(Collection 2 contains teeth from 51 to 100)

Module = (Pitch dia /Number of teeth)
If you want different gears with module and teeth tell it in the comment section