Level The X Carriage

Recap: I've assembled a Prusa Mendel 3-D printer from a kit purchased from nwreprap.kit.  I'm going through a set of calibration steps before I attempt the first print.

The extruder rides left and right on the X carriage which in turn rides up and down on two Z Axis lead screws which are controlled by the two Z axis stepper motors.  The X carriage must be leveled to ensure that your prints are square.  You'll need your digital calipers to complete this step.

This step is pretty simple: manually rotate either of the Z lead screws until the distance from the left Z stepper motor to the X idler and the distance from the right Z stepper motor to the X motor mount is the same.

Leveling the X carriage.  Red lines indicate distances that must be the same.  Orange lines indicate direction of travel