@mikaelgu said:

Found a small bug:
Regardless of the unit of measure of pitch radius, the face width is always measured in inches, makes it a little harder to make gears of certain widths when using the metric system.

open the plugin in notepad press ctrl+f or from Edit menu select Find... type "inch" (without quotes)and press find next button. You will see...

@@rad_pitch = 5.0.inch
@@face_width = 3.0

make it to

@@rad_pitch = 5.0.mm
@@face_width = 3.0.mm

then press again Find next and you will see...

number of teeth/inch

make it

number of teeth/mm

and press ctrl+s or from File menu select Save. That's it.

Plugin path is C:\Users\Username\AppData\Roaming\SketchUp\SketchUp 2019\SketchUp\Plugins