Autolevel with NPN NO Inductive sensor problems
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@phaedrux Yes certainly.
Let me try this. I think i understand the problem now. So my homing hits the endstop and gets a zero value from there. So the z trigger height is not used. That is why depending on the z end stop distance we see different heights in the above pictures. So the 0.7 (my z trigger) reflected on the distance from the z end stop 0..
One more thing. When typing the z trigger in G31 should it be negative?
eg G31 P1000 X-55 Y0 Z0.7
OR
G31 P1000 X-55 Y0 Z-0.7 -
It should be the value you get from doing the G30 S-1 procedure you linked above.
It will only be a negative value in cases where the nozzle ends up pressing down into the surface of the bed, like when using a nozzle contact probe like a piezoelectric.
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@phaedrux I mean it is not really negative but is it written like that? Writing it as a positive in the G31 gave the blue mesh result above which is below the xy plane.
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@gpetropoulos No you shouldn't flip the sign on it. The probe triggers before the nozzle touches the bed, correct? No after? That would be a positive value.
I'm hoping that after we change your homing file to use G30, and re run G29, we will get a better result.
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@phaedrux Certainly that solves the mesh problem at least. This looks much more consistent.
I used a negative value on G31. I am pretty sure that is it. I will run a test print and see for sure now.
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Using a negative value for G31 isn't consistent with how it should be working.
https://duet3d.dozuki.com/Wiki/GCode#Section_G31_Set_or_Report_Current_Probe_statusUse this to get the value.
https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height -
Updating my new Homeall using the z probe as z endstop.
; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2 on Thu Dec 13 2018 23:04:14 GMT+0200 (Eastern European Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-235 Y-220 F6000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000 ; go back a few mm
G1 S1 X-235 Y-220 F360 ; move slowly to X and Y axis endstops once more (second pass)
G90 ; absolute positioning
G1 X160 Y100 F6000 ; move probe to bed center
G30 F1000 ; probe the bed
G1 X0 Y0 Z2 F6000 ; return to home position and 2mm higher than the surface; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 S2 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning -
@phaedrux Not clear to me yet. I will try with positive then first and report back.
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@gpetropoulos Yes that looks good, except that G30 won't take an F parameter. It will use the F value given in M558 in config.g. I suggested a value of 100 earlier.
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@phaedrux Yeah probably. I tried the 100 and was too slow.
I have F1000 in my M558 and probably that is being used. I started the test print and seems to be working like a charm. 
Thank you very much. I would not manage to get it done this fast without your help. Cheers!
Wish you the best and a Happy New Year mate.So for anyone confused set positive value for trigger height in G31 command!!
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Glad it's working properly now. I think the issue was a result of Z0 being set differently than what the G31 trigger height would have given, and the difference was resulting in the huge offset from the Z plane in the heightmap.
