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Terrible screeching noise when raising and lowering printbed

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That doesn't sound so bad. Some kind of resonance? It sounds like a pure tone. Loud, high pitched, but almost a perfect sine wave.

Does your Z screw have a small amount of grease? You want a pea sized dot of grease - that's enough for the entire length of the screw.

How about the two Z rods? I would wipe them clean and add the smallest amount of oil to them. 1/4 the volume of a single rain drop for each z rod.

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Also check that it isn't something really silly like a piece of plastic somewhere that is rubbing up against something.

If you turn off the printer and move the bed up and down manually by grabbing the bed towards the back and pulling it up and pushing it back down, does it move smoothly? If you can't get the bed moving from the bottom you might need to use your fingers to twist the z-screw to get it up a couple of cm, after that you can usually pull it up manually.

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