NEMA 17 Stepper Motor Model 3D model

NEMA 17 Stepper Moto 3D modelA stepper motor, also known as step motor or stepping motor, is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.

*This is my first model to sell please provide me whith tips to get better