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There's a cyclic aspect to the metallic noise that would point to a fan blade rubbing somewhere. It's difficult to determine from the video if your extruder fan is running while the carriage is moving, but that would be one place to examine. Even though the power supply doesn't move with the carriage, consider to check the fan within that unit as well. Any ...


I'm having the same issue with Ender 3 V2. Everything tightened, Z-axis coupler not "slipping"... I noticed, that the error is made by the Z-axis end switch itself. I am not sure how that is possible but try homing several times and you'll see that the loud click when the switch is triggered occurs in a span of +/- 3 mm, which then results in a ...


I finally found the problem. The threaded rod of the Z axis was not mounted tight enough to the motor. This resulted in the slipping of the Z axis by large accelerations of the motor. So... tightening the threaded rod connector socket and redoing the leveling solved the problem.

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