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Step 8 Attach the Gantry Assembly to the X Frame
Assembly.
Step 8a Carefully align the Gantry Sides with the Rail
Supports in the X Frame Assembly. Make sure
the X1 and X2 Stepper Motor Idlers slide
between the Rail Supports as shown. Notice
that the Idler Bearings of the X1 Stepper
Motor fit between the rail supports.