Just having a great day.
I loosened the z-axis trapezoidal nuts, and that did completely make the noise go away. Except now the printer won't level properly at all.
Naturally I assumed this was because the bed was too loose and there was too much play, so I tightened the screws in the nuts back up. That didn't fix anything, but did make the z-axis much louder.
Long story short, the thumbscrews that hold the nozzle in were way too loose.
Lubricated the z-axis screws and that completely made the noise go away. Didn't want to look for the Prusa lubricant, so I just used the Mobil stuff. Smells the same as the grease on the rods, so it's probably fine.
#Prusa #CoreOne #3DPrinting