Install the double bearing holder and single bearing holder using M3 x 12 SHCS and M3 Washers.
Take note of the double bearing holder orientation. The end with the step must be in the correct location.
Do not tighten the screws all the way down. The bearings will be adjusted later and must wiggle at this step.
Using 4x M3 x 12 SHCS and M3 Washers. Install the X carriage guide as shown.
Tighten bolts all the way down.