Zitat

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-Zero correction in software between Z1 and Z2 because height of Z1 versu Z2 is pretty hard to ajust, opto is fix and is impossible to unscrew easily the blade, i put small electrical tape to make one blade longuer and now my Z1 is same height than Z2.

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This is simply done in basic settings dialog by adjusting HEAD1 to part surface and HEAD2 to part surface using same nozzle and same pickup position.