Extruder Drive Gear

I've this kind of Extruder Drive Gear. It works very well! I made a CAD porting in 3D (OBJ) format.

Specification Diameter: 12mm
Length: 13.5mm
Bore: 5mm
M3 x 4 Hollow-lock socket set screw

Suitable for 1.75mm and 3mm diameter material