Secure the Z stepper motors to the 2 new metal brackets with 4x M3x12 countersunk screws.

Secure the Z stepper metal brackets to the frame with 4x M4x12 socket head cap screws and 4x M4 T nuts. The Z steppers can sit flush on the top of the Y 4040.

Check the alignment. Make sure the stepper motor is straight in the mount.

Mount the 2x spider couplers to the stepper motors.

Take your Left and Right Z MGN brackets and thread them into their MGN carriages with 8x M3x6 socket head cap screws. We will tighten them during another step.