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All right, I just wanted to try if testing it with NEMA won't ring a bell in my mind.

  1. Oh, forgot about the voltage and current in the motors. I'll take a look at that and adjust it, since I didn't change anything on the drivers, and used them as they came.
  2. Well, as I try different speeds (Hopefully feed rate is the same as movement speed), the motors don't work. For X and Y I had the feed rate 10 for example, and it moved a little little bit and made high-frequency noise. So I found a sweet spot of 1. But now when I think about it, if I have too low current flowing to the motors, this may change.
  3. I tried different accelerations before to make them work in the direction I want, and I tried like 10 numbers between 20 and 300 and none of them helped, so yeah, I think I'll get back to it when all the motors are running smoothly.

To the bipolar hack. I did the same thing with 6 motors (5 by using drill, one by using knife) - cut the connection in the middle. I then measured every of them and confirmed that the connection was broken. And then desoldered the red (middle) cable. I think that is all that is necessary.
Thank you, I realised that I wasn't measureing two different coils, but the same one... So it's the resistance of the coil that makes my multimeter beep.

Will update soon, thank you for now :)