I'll leave that one to David, but I would advise to consider a more accurate probe, or just use the manual calibration for now. If you want any info on one particular probing system that might help see my signature.

@whosrdaddy said in Extruder sometimes cuts out in middle of long prints: https://forum.duet3d.com/topic/3483/extruder-motor-stops-during-print In 10 hrs of printing since adding grounding the extruder motor body (on a PG35L), with two prints, I haven't seen this issue recur yet. This isn't proof of a fix, but it's highly encouraging, since the MTBF seemed on the order of a few hours previously. I used a wire that is tucked between the outer shell and the heatsink, and connected to the power supply ground. Excited to be able to try other stuff now - updating to Duet firmware 2.0, trying out other slicers, etc!

OK i change the P9 to P5 and also Z2 to Z1 and now works i run mesh and i got this Number of probe points: 109 Probe area: 452.4 cm² Maximum deviations: -0.633 / 0.027 mm Mean error: -0.273 mm RMS error: 0.161 mm I m not sure if this is right