Zitat Zitat von edward1940 Beitrag anzeigen
I think you could try connecting as follows:

B2 of A4988 with Spule Y.2, B1 with Spule Y.Mittelkontakt, A1 with Spule X.1, and A2 with Spule X.Mittelkontakt.

Hopefully this will help you run more accurately.
I agree with you. All the comments emphasize the importance of correctly wiring the coils to avoid motor jerking or unstable operation. Alternating the connections between the coils and the A4988 driver improves operating accuracy.