I had some difficulties with the z-axle of my Ender 2 Pro, it partly lost steps because it had too little power.
I have now installed a Nema 17 40mm instead of the original Nema17 34mm. The original mounting is unfortunately only suitable for the 34mm variant. Therefore, I have constructed an alternative mounting variant.
Attention! I noticed that creality uses different pin assignments for its spepper motors, so I measured them with a multimeter and twisted the pins in the connector accordingly.
The author marked this model as their own original creation.