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After homing all of the axes place a folded piece of paper between the print surface and the nozzle of Hotend #1.
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Lower the Hotend in 0.1mm increments until the paper begins to be gripped by the nozzle.
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Make a note of the Z height displayed on the top right of the touch screen when the paper begins to be gripped. (This value will be 3.00mm to begin with, this is normal.)
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After sending a T1 command Hotend #2 should now be selected.
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The folded piece of paper should now also be between the nozzle of Hotend #2 and the print surface.
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Raise or lower the Hotend in 0.1mm increments until the friction between the paper and nozzle is the same as what the friction between the paper and the nozzle of Hotend #1 was.
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Once happy, make a note of the Z position of Hotend #2.
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In our case this was 2.10mm when the paper began to be gripped, but this value will likely be different for everyone.
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To find the offset value we need to do:
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(Step 1 Z value) - (Step 3 Z value)
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So in this example:
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Offset = 1.9 - 2.1 = -0.2
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Scroll down to line #191
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Enter in your calculated Z-offset value.
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Place the folded piece of paper onto the print surface under Hotend #1
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Send a T1 command to select the second Hotend.
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You should now also be able to feel the same friction between the paper and Hotend #2's nozzle.
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Increase the offset by 0.05, so new offset would become in our case -0.15
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Decrease the offset, so new offset would become in our case -0.25.
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Check that when one Hotend is selected the other has it's nozzle against the ooze shield.
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