⬢Place the Z-top-left on the rods and align it with the frame, and align the holes in the plastic parts with the holes in the frame.
⬢Use two M3x10 screws to attach the Z-top-left.
Don't use excessive force during tightening. In case of increased resistance, try to run the screws in from the other side of the frame first to "clean up" the threaded hole. Then return to the front side.
Tip: move the X-axis a few centimeters down for make some space if you can't reach the screw behind the rod.
⬢Repeat this step on the other side of the frame with Z-top-right printed part.
⬢Rotate both threaded rods in parallel to move the X-axis assembly a few centimeters higher to release the X-holder.
⬢Remove the X-holder from the printer.