The Creality K1 Max 3D printer utilizes different mainboards tailored to specific stepper motor sizes:
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Mainboard 4002020065: Designed for models equipped with 42-48 stepper motors. This mainboard is optimized to handle the electrical and performance characteristics of the smaller 42-48 motors.
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Mainboard 4002020073: Intended for models with 42-60 stepper motors. It is configured to support the higher power requirements and operational parameters of the larger 42-60 motors.