Select Z Position.
Using the knob, lower the nozzle close enough to the bed that a piece of paper barely moves underneath it.
If the paper moves freely, the nozzle is too far away.
If the paper doesn't move at all, the nozzle is too close.
The value should be somewhere around -8mm, as that is about the difference in height between the old hot end and the new.
When you're satisfied, press the knob button.
Use the knob to navigate to Set new Z=0.00.
Press the knob to store the new height.
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