This item does not contain a step motor driver, instead, it requires external step motor driver. Each one of this can drive two complementary step motors, ie, they share the same step pulse but moves in opposite direction. This is useful if you have to drive an axis with two step motors on each side. All controllers are same price, including the main controller. When placing order, please specify which axis it is for in the note. Available axis: X, Y, Z, R (rotation) and C (for main controller).
Note all system needs ONE C controller so that a camera can be controlled.