Featured here is a 3D printed gearbox that I designed, 3D printed, and assembled. This model was created for a short Nema Stepper Motor with an output speed of around 480rpm. The overall reduction of the gearbox is 1:9 so the final output speed is around 53rpm but with an increased torque. The yellow piece in the assembly is a basic attachment I used to articulate the speed of the gearbox and to test the attachment.