Originally Posted by
uncle_bob
The Z offset in the firmware is the distance between a typical trigger on the BL Touch and the typical hot end mount in the Makerfarm carriage. If you head over to the Prusa MK2, you will find that all of these sensors have a bit of fiddling involved with them. The part I designed up has a similar offset. It is *not* a perfect number. There is to much tolerance in the probes trigger point for that to be true. You go through a print / measure / change offset / new gcode (loop) process to get them set up.