Printing a full bed print on my V3SE and I notice that the extreme positions the extruder is squeaking whilst printing, not heard it do that before. Where do I lube it? I presume avoid the extrude gears to stop any lube going into the hotend.
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Get anywhere with that mysterious squeak noise sir…? Kind of curious myself what it is… 
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I was printing a 220x220x15 thick frame, I think because it was super shiney black PETG it was rubbing on the printhead entry. I bet if I ran it in super shiney black TPU it squeak even more. Like rubbing a balloon.
I have the same problem it started few days ago, I uninstall extruder and check gears but all the internal parts are ok and the problem persist, I read about calibrate steps but only there tutorials for V3, not for SE or KE.