(1) The stepper motor selected is not good. It is normal to know that the motor temperature rises as the 3D printer prints. If you buy a motor that is cheap and has poor performance, when the current is large, it will easily heat up and cause the motor to stop or lose.
(2) Abnormal motor operation If the motor temperature is very high just after the start of printing time, the motor is running abnormally.
(3) Motor heat dissipation is not good If the heat dissipation is not good, the motor temperature will continue to heat up as the printing work progresses. Therefore, it is best to equip the 3D printer with a heat sink or a cooling fan, so that the cooling measures can be given.