PINDA / Z probe / Mesh Compensation / offset / area for mesh

Veti

@Veti said in PINDA / Z probe / Mesh Compensation / offset / area for mesh:

can you post your revised homeall?

again please post your revised homeall

hmmatos

@Veti I just add the line from homez.g to put the head over the centre of the bed

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.2 on Mon Nov 11 2019 19:21:19 GMT+0000 (Hora padrão da Europa Ocidental)
G91                     ; relative positioning
G1 H2 Z2 F6000          ; lift Z relative to current position
G1 H1 X-305 Y-305 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000       ; go back a few mm
G1 H1 X-305 Y-305 F360  ; move slowly to X and Y axis endstops once more (second pass)
G1 X150 Y150 F2000  	; put head over the centre of the bed, or wherever you want to probe
G1 H1 Z-405 F360        ; move Z down stopping at the endstop
G90                     ; absolute positioning
G92 Z0                  ; set Z to axis minimum (you may want to adjust this)

; Uncomment the following lines to lift Z after probing
;G91                    ; relative positioning
;G1 S2 Z2 F100          ; lift Z relative to current position
;G90                    ; absolute positioning

Phaedrux

@hmmatos said in PINDA / Z probe / Mesh Compensation / offset / area for mesh:

I have the Z endstop connected to the board but is is not in use is not mounted on the printer.

@hmmatos said in PINDA / Z probe / Mesh Compensation / offset / area for mesh:

G1 X150 Y150 F2000 ; put head over the centre of the bed, or wherever you want to probe
G1 H1 Z-405 F360 ; move Z down stopping at the endstop
G90 ; absolute positioning
G92 Z0 ; set Z to axis minimum (you may want to adjust this)

If you're not using the Z endstop you need to change your homeall to use a G30 command to set the Z0. This would explain the offset you're seeing.

https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_Z_using_a_Z_probe

Your homeall should be

G91                     ; relative positioning
G1 H2 Z2 F6000          ; lift Z relative to current position
G1 H1 X-305 Y-305 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000       ; go back a few mm
G1 H1 X-305 Y-305 F360  ; move slowly to X and Y axis endstops once more (second pass)
G1 X150 Y150 F2000  	; put head over the centre of the bed, or wherever you want to probe
G30 ; set Z0 using the probe

hmmatos

@Phaedrux thanks, I'll change that and test again

hmmatos

is this a good result?

25/11/2019, 19:25:39	G29
180 points probed, min error -0.030, max error 0.485, mean 0.136, deviation 0.095
Height map saved to file heightmap.csv

is not looking good

printscreen

Phaedrux

Your bed appears to be cupped which isn't uncommon. The question is, does mesh compensation adequately correct for the bed shape? Are you able to get a good first layer? I don't think it's too extreme for it to handle. Your first layer will likely need to be slow.

hmmatos

@Phaedrux I'm doing some testing prints with the first layer at 30 mm/s
The first is looking good but is a small benchy I have to do something with a big footprint

And yes I think is cupped, Creality beds are not very straight

Phaedrux

bedlevel_nozzle_0.4_200x200-0.3-0.8.stl

This is a good model to test the bed with.

hmmatos

@Phaedrux thanks, I'll test with that

hmmatos

well is not perfect but I think it works