I looked through your whole thread.
Your spacer and nut trap, which is on top which is on the bottom? (I put the spacer on top and nut trap at the bottom).
Have you disconnected and removed the Z motor from the bracket and replace it, leave the pineapple coupler on the Z rod and turn it all the way down and up by hand? (I had issues with my prints and discovered hidden binding when I did this. Required reprinting some parts)
Have you tried swapping the Z driver with one of the others? (If it moves, could be a driver. If it doesn’t, could be stepper or wiring. Perhaps interference on the wiring. Perhaps isolate the Z wiring to test that theory).