Not worth to repair since they are cheap imo, but dont buy a motor before you confirm its not something else. You have 3 components, motor, wire and stepper motor. Plug it in x driver and move your x. If the problem is still there its motor or cable. Then switch cables if they are detachable, or visually inspect cable/connector. So if you are looking for feplacement, just find a label on your motor and search that on internet. If you dont chose the same model you might need to change your stepps/mm in fw or adjust current (vref). Its most likely nema17 bipolar 1.8 deg, but you have to check length to be sure it fits where your extruder should be. Simmilar size = simmilar power, but you shoudl fine tune your vref anyway. Too much current = motor overheating or stepper motor overheating and it can also skip, too low current = motor skipping. If it died you might be running it too hot, but you would probably burn driver first.

First of all thank you for your answer.

I will try to test it with the x axis I don’t know that will work.

I try to put a led and it light up ok on both poles.

I did search using the number on the motor, but I wasn’t able to find the exact model.

So can I just buy a similar size and wires and fine tuning in the firmware if anything goes wrong ?

The bill of material just says 42HD1418-01,Two-phase,25mm.

So any nema with 25 mm and 4 wires will work ?

Sorry for the lots of questions, but I’m a little lost in this replacement.