In this step we prepare the X axis for later assembly on the Z axis.

If you are using the Bear X axis or the Original Prusa MK2(S)/MK2.5(S) X axis, you will need to unscrew the smooth rod tensioning screws, as shown (by approx. 2mm).

If you still have the X carriage (or extruder) in place, you must ensure that the X axis belt is not under tension.

Bear extruder and X axis (BearExxa), BearMera of Bear X axis with Bondtech extruder: release tension using the belt tensioning screws.

Original Prusa MK3(S): remove the 2x top motor screws and release tension of the screw on top of the arm. Then rotate the X motor.

Original Prusa MK2(S) or MK2.5(S): remove the 2x top motor screws and rotate the X motor.

Be careful, if you still have the X carriage (or the extruder) in place you will have to disassemble the Z motors to insert the X axis in the next step.