20 : 20
Miter pair · module 1, printed
m 1 · 20° · straight, AGMA 2005 proportions
A small printable miter pair on 5 mm D-flat shafts.

The most common stock miter size: 20 teeth, module 1.5, Gleason proportions that match catalogue gears.
The link opens the pinion and gear in the Bevel Gear Designer's 3D view. Change the teeth, the module or pitch, the shaft angle, the bores or hubs, then download STL, STEP or a drawing.
m 1 · 20° · straight, AGMA 2005 proportions
A small printable miter pair on 5 mm D-flat shafts.
m 2 · 20° · straight, Gleason proportions
25-tooth module 2 miters on 12 mm keyed shafts.
m 3 · 20° · straight, Gleason proportions
A heavy 1 : 1 corner drive: module 3, 20 mm keyed bores.
16 DP · 20° · straight, AGMA 2005 proportions
Robotics miters: 16 DP, 20 teeth, both on ½" hex shafts.