Having the same issue... from my measurements I have the 8mm x 1.25mm threaded rod (what came with the kit) which would require 2560. I've adjusted it to the correct number (and even taken it up as high as 4000), and it seems to make no difference, I still have about a 3-4mm gap between the bed and the nozzle.
Am I missing something? Is there another variable I should be adjusting or possible issue afoot?
I have the auto-level version if that makes any difference & the nozzle level was functioning correctly on the stock firmware when I first set it up. It auto homes fine and has the right height of the bed when auto-homed.
Appreciate any thoughts you might have.
boomhaeur: Take a look at the #define Z_PROBE_OFFSET_FROM_EXTRUDER value. It will vary based on how far above your extruder your sensor is mounted. Mine is currently set to -0.7 based on my setup.
I have noticed, though, that the sensor that comes with the 3DP12 does vary by a few tenths of a mm, which is not good. I am wondering if it is due to the fact that the sensor is only powered by a 5V source when the datasheet lists the minimum voltage as 6V. Has anyone tried hooking the sensor up to 12v/24V and using a voltage divider on the output to get it back to 5V? I had a capacitive sensor on my last printer that was powered by 12V and it was much more accurate.