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The final thing that we need to measure is the trigger height of the BLTouch. This will be the G31 Z value.

For detailed instructions, see the main documentation for Testing and Calibrating a Z Probe.

The procedure for finding the trigger height is best described in the link above. But basically it involves moving the nozzle to just touch the bed, using G92 Z0 to reset the bed position. Moving the nozzle up 10mm, and then issuing G30 S-1 to find the trigger height, which is reported in the gcode console.

When the BLTouch is mounted correctly 8mm above the nozzle tip, the trigger height ends up being close to 2mm.

We now have all of the probe offset values for G31 to inform the firmware of the position of the probe relative to the nozzle tip.

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