With Hotend 1's nozzle brought down to your bed, use a piece of paper to judge the distance between the tip of the nozzle and print surface.
Send a T1 command to switch to the second hotend.
Check that the friction between the second nozzle and print surface is the same. If it's not, adjust the height of the second hotend by loosening the two M3 x 12mm bolts holding it in place.
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