Removing the press-fit gear from a Creality 42-40 stepper motor is notoriously difficult, as Creality uses an interference fit that essentially fuses the gear to the shaft . Unlike gears secured with grub screws, these pressed gears require specialised techniques to remove without damaging the motor shaft. This guide covers three proven methods: using a gear puller or custom 3D-printed extractor, pliers for lighter interference fits . We also discuss the practical alternative of simply purchasing a replacement motor with the correct D-shaped shaft .
Credit: PrestigeWorldWideNorth Youtube Channel
Video: https://www.youtube.com/shorts/rbO81hLkxNc
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