Parametric Involute Bevel and Spur Gears
If you want to print gears, you have come to the right place. This OpenSCAD script provides modules for both Spur and Bevel Gears:
Parametric Involute Bevel and Spur Gears (for OpenSCAD) by Greg Frost.
Greg Frost developed these gears as a useful utility but primarily with a view to printing this amazing 3D puzzle that someone linked in the "Let's design something! (I've got an idea ...)" forum : Heart Shaped Conical Gear Cluster.
The design has evolved to the point where the gears are modeled, but the task of working out how to mount them still remains to be done:
Each gear will need to be printed in two parts and joined together.
And printing begins: