Problem with 3DTouch autolevel sensor

[Napalm]

Hi,
yesterday I received my 3dTouch autolevel sensor and installed it on my geeetech prusa I3 Pro B acrylic.

I followed the instruction manual and everything seemed to work fine. Then I noticed, that after a auto home (G28) or autolevel (G29) the nozzle is about 0.6mm over the bed.

I replaced the nozzle and the heater a while ago, so the dimensions may not be exactly the same as on the original prusa and in the manual.

So I changed
#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.4
in the firmware, but no matter what value I choose then distance between bed an nozzle stays the same.

Is there any other value I have to change to get the nozzle closer to the bed?

regards
Mirko

[William]

Nope,it the place that matters it.
You can modify it .1 one time until you confirm it.
And the modification will take effect when the print starts.

[Napalm]

So at last it was a mechanical problem.

In the 3D Touch sensor the needle which comes out at the bottom is fixed to a magnet with a shrinking tube. That was loose. So the needle could move within the shrinking tube and the distance to the magnet changed from time to time.

I opened the sensor put a bit glue into the shrinking tube, fixed the needle and now everything works as expected.

regards
Mirko