You can level very precise but the exact height still depends on the nozzle temperature as well. With temperature the nozzle expands. That is why the piece of paper (0.1mm) room must be there so that at print temperature the nozzle touches the bed. So your tool is probably too exact for this. I guess your CNC machine does not have that temperature limitation.
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raytrace-nomad 1
Thanks for the answer,i picked up my um2 one hour ago , and calibrate manually it looks ok.
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