Hi . I have a M2 V4 printer with BLtouch sensor for some time i have a problem with the Z offset . I use the M851 command to set the offset
store it using M500 and recall it with M501 . first print is ok but for some reason suddenly the next or maybe the follow one the print is fucked up and the extruder offset is changed ( I can see that it is not in right space from bed almost in 0.5 mm or even more ) and I have to change again the M851 parameter .
Reset or powerup does not help when I try to read the M851 it display the value that I entered and stored
I try to run manually the M28 and M29 commands it show that the bed is leveled
Any idea ?
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