stepper motor buzzing sound?

[wyndham]

Steppers usually squeak, but a squeak can become a buzz if it coincides with the resonant frequency of something connected to it. Try leaning on the screw and places where the machine parts bolt together, look for somewhere that changes the buzz. Alternatively, perhaps one stepper driver has gone off frequency, try swapping the X and Y drivers connections over, does the buzz follow the driver?

thanks for the tip it seems to be more of a hissing than buzzing
i swaped the x and y leads and the hissing stopped so its the driver board i believe.
it seems to work though so i'll probably just leave it