Z probing with extruder nozzle
I built an extruder mount that enables the extruder nozzle tip to be used as probing point.
The extruder is mounted on a hinged plathorm. As the nozzle goes down, pressing against the plathform, a limit switch is triggered (Z probe is triggered). Image below explains the principle.
The problem is that the triggered probe point is actually below the Max Z height of the printer.
Repetier seems to have a problem accepting this.
Also, setting the Z probe height to a negative value does not solve the problem as the levelling sequence is cancelled by setting when setting a negative height.
Is there any way to solve this? Some short directions might help me change the firmware.
Also, this might be a good option to add to the firmware. This way of levelling has some advantages:
-Measure Z height as the nozzle itself, thereby reducing errors
-Compensate for nozzle expansion when nozzle is heated. Expansion is different fro PLA vs ABS temperatures
-No deploying or retraction scripts needed.