I have found the answer, through bambulab support. You need to re-align the z axis screw. It needs to be centered when you remove the top plastic cover. You can get the axis to the very top (care for ball bearings if you lift too much they will fall out) then loosen the two screws by half a turn a or a turn, then lower the axis, center the rod, tighten the one you can reach. Bring it back to top and tighten the other screw.
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