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I've upgraded my Anycubic I3 Mega (Trigorilla) "S" to the TMC2208 drivers. I've found on forums various guidelines for the reference voltages: 0.85V, 1.06V, 1.2V, with someone saying 1.5V needed on E0.

After installing the TMC2208's and with the motors removed, I've checked the reference voltages and found them to be (X,Y,Z,E0, E1)= (1.11, 1.11, 1.09, 1.18, 1.11)V and left them like that.

Now, when fast extrusion or retraction occurs, there's a nasty noise from my extruder motor. Can it be that 1.18V is too low for E0?

Note that I have the newer/upgraded "S" extruder from Anycubic.

Is there any generally agreed opinion on what the Vref's should be for TMC2208's in Anycubic I3 Mega (Trigorilla)?