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5.2- Assemble Z-axis lead screw
Loosen the screws on the coupling first, insert the lead
screw into the coupling, and then lock the the screws.
Loosen these four screws, you can fine-tune the position of the
Z-axis motor from front to back, left and right, so as to adjust
the verticality and concentricity of the lead screw assembly,
and then tighten the screws again after the adjustment.