sherpa mini extruder suitable for 5mm shaft stepper motor

对于同一电机，2mm轴的成本为59元，而5mm轴仅成本为8元，简直不可理喻。我在互联网上找不到修改后的版本，看来我只能自己做一个了。

For the same motor, the 2mm shaft costs 59 yuan, and the 5mm shaft only costs 8 yuan. It is unreasonable. I can't find a modified version on the Internet. It seems that I can only make one by myself.