Hey, have a look here:
I have not read this but i guess there is all information needed.
First, start of the gcode you need to home and preheat your bed and extruder.
Preextrude now like at the beginning of a print, extrude a bit more because we can’t do a skirt.
Now we have to set the extruder to the new value
G92 E3886.14 for example, g92 to set the axis to this value
After this go to the correct position or a new height, you measured 12mm, previous height was 11.92 so the next would prevent from crashing, i took 12,12 (or so, btw, now you see how exact it needs to be?).
Make it slow with F300-600, like
G1 F600 X146.01 Y 156.01 Z12.12
You have to delete the printing lines which are printed before, excluding the preprint moves.
Hope this helps. - If needed i could make a video for you…