If you have the Flexplate upgrade make sure it is on the platform before starting.
Click "motors off" in Pronterface. Manually move the tool carriage so that the probe is hovering over the centre of the platform.
Lower the gantry by hand so that the nozzle comes close to the print surface. Once close enough the red light on the probe should come on before the nozzle hits the print surface.
Ideally, when the probe is triggered (as soon as its light shines) the tip of the nozzle should be no more than 1mm above the print surface.
Nozzle hits the print surface before the red light on the probe comes on:
Lower the probes position on the mount and check again.
Red light on probe but nozzle tip is too far away from the print surface:
Raise the probes position on the mount and check again.
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