After eliminating the Z screw and the guide rails, the only thing left was the tab on the back of the build plate.
When I inspected the back panel, I found some small marks made by the tab rubbing on the panel. This was after I reassembled everything so rather than take the build plate out, I sanded the back panel down and now I get silky smooth Z travel again.
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gr5 2,224
Don't know.
Is there lots of grease on your Z screw? There should be - if you touch it you should get lots on your hands.
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