The z axis homing is acting inconsistent no matter what I use to command it - the LCD on the printer itself - the Repetier Host software I don´t have bed autoleveling of any kind. I already surfed through tons of forums and I could not find a fix for my issue. I will appreciate ANY help, because I am out of ideas (maybe it is my lack of I have an Ender-5 Pro with a 4.2.2 board, Marlin Ver 1.1.1 (2020-04-25). I installed a Creality BL Touch V3.1 and followed the instructions at Issue 1: When I first start the machine, I can move the Z-axis up and down freely. However, once I "auto home" the machine as stated in the instructions, it will place the print head towards That is how it works. Remember, homing doesn't mean "move to 0,0,0", it means "find out where 0,0,0 is". Where the nozzle ends up is irrelevant to the homing process, as long as Marlin knows where the nozzle is at the end of it. If you want to move to 0,0 after homing Z, do "G0 X0 Y0" or "G28 X Y" after the initial "G28". $\begingroup$ As a comment, homing is defined as G28 or followed by an axis letter as a flag, not a zero/digit/number after the letter. The X, Y, and Z parameters act only as flags. Any coordinates given are ignored. For example, G28 Z10 results in the same behavior as G28 Z. from G-code manual.Don't read parameters from memory (M501) unless you changed parameters you want to revert back No it does not. In fact, when I hit "Home Z" it just goes higher every single time. Whenever I hit Set Home, it never remembers where I set it. It just moves the x, y, and z axis about 5mm each time and always in the same direction. Its strange, and I have no idea why its acting like that. If the probe doesn't retract almost instantaneously, perhaps it's sticky and not sending the trigger pulse to the mainboard. If it does retract but the Z axis doesn't stop, suspect the wiring, or more precisely the firmware config which determines the wiring needed. Different wiring schemes require different firmware. .

marlin z axis not homing