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o_lampe
There are drivers with 1/128 microstepping, but AFAIK they require rewriting/reflashing the firmware ( Marlin on Ramps? ). Not recommended for beginners.
Why not stick to A4988?
I've got a GT2560 Controll board, it has the same pinset of old ultimaker board. I don know anything about mecchanic and electronic, I bought this stepper motor [www.amazon.it]
I don't know If the a4988 are enought power to move this motor.