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- BLtouch/EZABL/Pinda probe - The nozzle is in mid air when these probes are triggered, which will require a negative Z offset.
- Manual mesh bed levelling - The nozzle and bed will be very close when manually probing, requiring a Z offset close to zero.
- - CR-6 style strain gauge - The nozzle touches the bed and flexes upwards to trigger the probe. This means the trigger poiunt is actually higher than the nozzle tip, and requires a positive Z offset.
+ - CR-6 style strain gauge - The nozzle touches the bed and flexes upwards to trigger the probe. This means the trigger point is actually higher than the nozzle tip, and requires a positive Z offset.
The following picture shows Z offset for a BLtouch. You can clearly see the vertical difference between the probing point (tip of BLtouch) and the tip of the nozzle.