How to align the gantry

Square the gantry

Power off the printer and unplug the X & Z motors
Loosen the X & Z belts as we gonna move the tool head manually and don’t want to fight the motor 3. resistance
Place 2 same size objects on the frame and put the X rail (not the extrusion) on it. use a somewhat leveled bed if you cant use the extrusions
Loosen the blocks connecting X extrusion and Z rails (the M5 screws), check if these left marks on the extrusion because they were to long
Press the X extrusion to the back of the printer and down on the 2 objects. Tighten the M5 blocks connecting X extrusion and Z rail again
Tighten the XZ belts until they sound somewhat like a guitar and roughly the same (dont need to be perfect). Do a little bit at a time on each motor mount.
Move the gantry up/down and left/right always going back on the 2 objects
Tighten the side with gap between rail and object or loosen the side sitting on the objects
Repeat last step until it both sides always rest on the object after every move of the tool head (move it up/down and left/right)