MarlinKimbra - Z-Probe works but not at first shot.

Hello
I'm using RAMPS 1,4 and an inductive Z-Probe sensor LJ18A3-8-Z/BX with MarlinKimbra 4.1.2.



The sensor works connected to the Z-Min 3 pin connection.

The nozzle offset is ok but..

As I make the first attempt to print almost always my nozzle is too high on the printing surface..

I must stop and redo at list once to start the print correctly, usually the third shot goes to target..

Every time the printer perform the autolevel procedure..

My start GCode is like this

Quote

G28 ; Home extruder
G29 ; Autolevel
G1 X0 Y0 F9000
G1 Z15 F9000
M109 S200 ;Uncomment to add your own temperature line
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G92 E0 ;zero the extruded length
G1 F200 E3 ;extrude 3mm of feed stock
G92 E0 ;zero the extruded length again
G1 F9000
;Put printing message on LCD screen
M117 Printing...

What could be the problem?

Thanks
Pietro