The file 'Key Hole For Arduino Stepper Motor 3D Printer Model' is (STL) file type, size is 3.1KB.
This is the outline for the rod sticking out of the motor. like where you attach things onto the motor. you can go into tinkerCAD, make some gears on STLgears.com, and punch a hole through it. the tolerances are a little tight but just trust, fits like a glove!
MOTORKEYHOLE.STL | 14.0KB |