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Z axis lead screw makes terrible noise and vibrates when lowering
A have a JG Aurora A5. A couple years ago, the hot end crashed into the print surface hard, for no apparent reason, destroying the fan duct. I didn't repair it for a couple years, at which point I could not lower it on the z axis -- the motor turned but it just bound up. I sprayed the lead screws generously with lubricant and eventually got it to work. After printing an improved "blowhard" fan duct to replace the destroyed one, replacing the blower fan which had also failed, disconnecting the filament sensor which constantly falsed, and spending a lot of time bed leveling, it is now printing better than ever.
However....it now makes a terrible noise when lowering the Z axis, and the right lead screw vibrates and wobbles (see this video). It doesn't seem to affect printing, but it definitely seems like something that needs to be fixed.
Any ideas on what exactly might be wrong and/or how to repair?