FOLLOW THE INSTRUCTIONS, there is a risk of DEFORMING THE FRAME!
⬢Insert M4 screws in both holes in the frame.
⬢Adjust the position of the PSU, there are holes in the casing, which must align with the holes in the frame. By default the PSU is lower than needed, pull it slightly up.
⬢Tighten the M4 screws but not too firmly, wait for the next instruction.
⬢Before tightening the M4 screws, make sure the PSU is pressed against the printer (aluminium extrusion) and also in direct contact with the vertical frame.
⬢Everything aligned? Tighten the M4 screws.
⬢Now, tighten the M3 screws connecting the PSU with the extrusion.