Consider to follow if you like what I do.
Just ask if you have an idea to a lego piece you want to be made.
Lego clutch gears From 17t all the way to 39t except 20t, 24t and 36t. They're in a different "thingiupload".
This pack contains all the clutch gears Lego probably will never make.
I have only tested a few, but they're all made with the same specs with the gear generator so they should work fine.
layer height: 0.1, initial can be 0.2, but then you'll get a small elephant foot
Perimeters: 12 (just to be sure it only using lines, no infill)