Felix printers Pro L Quick Start Manual page 29

You can see the red one is higher than the white one. To fix this go to the Printer Calibration menu
Adjust the Z offset to make the right head print higher or lower the machine calculates this and compares it to the left nozzle and
makes them print on the same level as each other. To make it easier – is further away + is closer to the bed so if we were to change
the value of -0.908 with 0.05 to make it -0.858 it would print 0.05 closer than before
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Quick Start Guide FELIX Pro L / XL