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I upgraded my Ender 3 to a Hemera hot end. Afterwards, the Z axis was binding and the calibration cube had a bulge in it. There's a really common fix for this issue: shim out the z axis stepper motor. That wasn't the problem on my Ender 3 Pro though. It was something completely different.

Teaching Tech's 3D printer calibration web site is: https://teachingtechyt.github.io/cali...

Why the Sovol SV01 has been my workhorse for the last year plus:    • Why the Sovol SV01 is my first 3d pri...