What acceleration are you using? Reducing it may help.
The torque from a stepper motor starts to fall off above a certain speed, and that speed depends on the supply voltage to the drivers. To maintain torque to higher speeds, you need a higher supply voltage. See [duet3d.com] and work out whether 12V is sufficient for the top speed you want to achieve.
The torque from a stepper motor starts to fall off above a certain speed, and that speed depends on the supply voltage to the drivers. To maintain torque to higher speeds, you need a higher supply voltage. See [duet3d.com] and work out whether 12V is sufficient for the top speed you want to achieve.