The next cable is for the extruder stepper motor, and it is a longer version of the other
stepper motor cables.
The easiest way to feed this cable through is to take the four-way plug end and feed it
first through the top plate, and then through the side shield, following the path of all
the other cables. Then plug the six-way end into the extruder stepper motor.
Then plug the four-way end into the E0 connection on the main board.
