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[JAZZCNC]

You'll note I said Nema24 not Nema23 ?

As far as I could tell at the time, the 3.1Nm motors we usually suggest from CNC4YOU: Stepper Motor Kit 3.1Nm x 3 Axis + 3 Mounts Nema23, are pretty much the same, the only difference I could see was the Rear Shaft and Wire length.

Have you measured the Outside Lee. Usually nema 24 are 60mm while nema23 are 56mm.!