Fit the T-Nuts on the linear rails inside the profile slots and use the MGN Alignment tool to align the rail. On each rail, start by tightening the top screw then move down to the bottom screw. Do not bolt down all of the screws in between for now, later adjustment may be required

Attach the 3x 400mm Z rails into the frame

If you don't have a MGN Alignment tool, measure the space between the side of the rail and the side of the extrusion - for 3030 it should be 9.00mm on each side - measure each rail in 4 points

The rails should not rest on the motor mounts but instead be fastened approx. 1mm above