@norder already tried that with less than half of the speed that I have.... F160

@phaedrux And when you measure the trigger height you are putting it into G31 in config.g?
Yes

If you send G31 by itself, does it report back the same value?
Yes

Can you homeall, then move the probe to the center of the bed, and send G30 to probe. Then send G29 S0 to create a fresh heightmap and see how it looks?
Same, no change:-(

What other thread are you alluding to?
Just google: Warning: the height map has a substantial Z offset.... the first 5-7 results, I think the majority is from this forum... Don't get me wrong that guy dc42(I think) is for me number1 in anything related to Duet...

@phaedrux Does it have a consistent trigger height all locations on the bed?
Yes, the error Is marginal about 0.02-0.04max

How are you measuring the trigger height?
G30 S-1

If you use homeall and then command the nozzle to Z0, does it touch the bed, or is there a gap?
It's touching the bed, no gap, Z=datum is as set initially, Z0

I don't get it how or why does the extra +2.5-3.0mm difference comes from?
Just printed and crimped the wires for the duet IR probe and will mount it tomorrow, if that shows the same results, I'm gonna compile everything from scratch.... Thanks for your effort!
I see that I'm not the only one with this problem and dc42 moderator is puzzled by this and provided similar advice to no avail....

@norder thanks, anyway!

@norder with IR probe just want to rule out the possibility of a faulty Omron probe, the problem is that the mesh bed is up, didn't change anything on the printer or the settings except the z offset because probing the bed,now shows bed is up significantly, as the Warning and title of the post is saying, and yes, I make at least 10 trigger height and make a average of the results(with a clean nozzle and without filament in the hotend, with a printing temperature for bed and hotend, have macros for PID tuning, depending on what material is used, mostly PETG-222,80 / ABS,ABS+,ASA -240,100)

@norder sorry if I offended you,
Vanadium Nozzle 0,40 -35.80€
Mosquito Thermistor -29.00€
Mosquito 24V 50W Heater -22.50€
Mosquito 24V Fan -7.90€
Mosquito Boron Nitride Paste -10.22€
Mosquito Hotend -153.41€
Shipping -20€
Total:278.83€
When you put that in the contents of the hot end model and price, you are probably take a good care of it....

@norder this is before RRF3.4

I have a Duet3D DC42 IR sensor / Probe somewhere laying around, will try with a different probe to see the difference and report the results

@printingforfun people here already addressed this problem...and what I have found it's not resolved, I am just bringing the question again if somebody found solution

@norder Z offset was (before RRF3.4)usually around 0.45