When mounting a pair of rails which will be attached to a single part, such as a printer bed support, we must be careful to ensure that the rails remain parallel to each other.
Follow step 3 for the first rail (herein described as the stationary rail). Ensure that the stationary rail is aligned correctly and the carriage(s) run smoothly along its length.
Prepare the parallel rail as instructed in step 3, up to and including placing it upon the extrusion.
Attach the component which will connect both rails, such as the bed carriage plate, to all carriages on both rails.
Gently bring the carriage of the stationary rail to one end of the rail, this will also move the carriage on the parallel rail.
Slightly tighten whichever M3 bolt is closest to the carriage on the parallel rail.
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