Bed flat at origin,inclined during prob sequence before printing

[Sowlan]

Hi everybody!

I had finish to build my BLV printer at end when I tried to print square test model It look like same at picture N°1.

After some research I'd see something strange, when I start printing during probing/compensation sequence, my bed became inclined (see picture N°3), the right side become higher than left side. Before launch my test model in WebUI I had do home all true leveling and home all again, followed by mesh compensation and home all (Picture N°2).

I adding my printer have two Z axis at left & right sides, left side is minimal X axis and right side is maximal X axis, the back side is Y minimal and front side is Y maximal.

One more thing strange the 3D Heightmap shown is mirroring, x,y,z mark at back left corner is at good place and front right corner also, but the right back corner and left front corner is permute, right back corner in picture (X30 Y190) on my printer is at left front corner, left front corner in picture (X190 Y30) on my printer is at left front corner. Maybe that's one symptom of the problem.

I had spend 3 days of my time in this problem and no find when come it and I need urgently my printer print well for my work. I add also some files config.g, bed.g and start script I use in Simplify3D.

config.g

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.6 on Mon Jan 13 2020 20:14:51 GMT+0100 (heure normale d’Europe centrale)

; General preferences
M80						; Turns on the ATX power supply
G90                                                ; send absolute coordinates...
M83                                                ; ...but relative extruder moves


M667 S1                                            ; select CoreXY mode

; Network
M550 P"BLV mgn Cube"                               ; set printer name
M552 S1                                            ; enable network
M586 P0 S1                                         ; enable HTTP
M586 P1 S0                                         ; disable FTP
M586 P2 S0                                         ; disable Telnet
M587 S"ferguson" P"rearview-picnic-gasp-neff-frays-impotency"            ; Configure access point. You can delete this line once connected

; Drives
M569 P0 S0                                         ; physical drive 0 goes forwards
M569 P1 S0                                         ; physical drive 1 goes forwards
M569 P2 S1                                         ; physical drive 2 goes backwards
M569 P3 S0                                         ; physical drive 3 goes backwards
M584 X0 Y1 Z2 E3                                   ; set drive mapping

M671 X-25:313 Y150:149 ;gauche X-25 Y150 droite X313 Y149

M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
M92 X200 Y200 Z400 E415				   ; Set steps per mm for Bondtech. (AJOUT)
;M566 X600 Y600 Z24 E200                           ; Set maximum instantaneous speed changes (Jerk) (mm/min) (AJOUT)
M566 X600 Y600 Z24 E300                            ; Set maximum instantaneous speed changes (Jerk) (mm/min) (AJOUT)
;M203 X20000 Y20000 Z600 E2000                     ; Set maximum speeds (mm/min) (AJOUT)
M203 X20000 Y20000 Z600 E3600                      ; Set maximum speeds (mm/min) (AJOUT)
;M201 X3000 Y3000 Z100 E5000			   ; Set accelerations (mm/s^2)(AJOUT)
M201 X3000 Y3000 Z100 E2000			   ; Set accelerations (mm/s^2)(AJOUT)

M906 X1600 Y1600 Z1600 E1600 I30                   ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                            ; Set idle timeout

; Pressure advance
M572 D0 S0.55					   ; disabled Pressure advance

; Axis Limits                 
M208 X-21:307 Y-35:302 Z0:649			   ; set axis


; Endstops
M574 X1 S1 P"xstop"                                ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop"                                ; configure active-high endstop for low end on Y via pin ystop

; Filament sensor
;M591 D0 P1 C3 S1

; Z-Probe
M574 Z1 S2                                         ; Set endstops controlled by probe
M558 P1 C"zprobe.in" H5 F200 T9000 R0.5            ; set Z probe type to unmodulated and the dive height + speeds
;G31 P500 X-2 Y-16.4 Z1.165                         ; set Z probe trigger value, offset of 2 in X and 10 in Y and trigger height
;G31 P500 X-2 Y-16.4 Z1.15                         ; set Z probe trigger value, offset of 2 in X and 10 in Y and trigger height
G31 P500 X-7 Y19 Z1.15                         ; set Z probe trigger value, offset of 2 in X and 10 in Y and trigger height

M557 X30:260 Y30:260 S80                           ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 R4700 C0    ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                              ; create bed heater output on bedheat and map it to sensor 0
M143 H0 S100                                       ; set temperature limit for heater 0 to 100C
M307 H0 A85.0 C236.3 D5.4 V24.0 B0		   ; Set PID for heated bed values

M308 S1 P"e0temp" Y"thermistor" T100000 B3950 R4700 C0     ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
M143 H1 S260                                       ; set temperature limit for heater 1 to 260C
M307 H1 A405.7 C118.3 D6.2 V24.2 B0			   ; Set PID for hotend values

; Fans
M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                     ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T35                                  ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan1" Q500                               ; create fan 2 on pin fan1 and set its frequency
M106 P2 S1 H1 T35                                  ; set fan 2 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                                   ; define tool 0
G10 P0 X0 Y0 Z0                                    ; set tool 0 axis offsets
G10 P0 R0 S0                                       ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

; Miscellaneous
;M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

M911 S21 R22 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings are not configured
M564 H0                                   	   ; Let the Jog buttons work blv: added to allow jog buttons

bed.g

; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool v2.1.6 on Mon Jan 13 2020 20:14:51 GMT+0100 (heure normale d’Europe centrale)
;M561 ; clear any bed transform
;G29  ; probe the bed and enable compensation

M291 P"Probing mesh grid process started" R"Probing.." S1 T2
M561               		; clear any bed transform
G28				; home all axis bb
G90 				; absolute positioning bb
M557 X30:260 Y30:260 S80	; Define mesh grid
G29 S0				; Probe the bed and save height map to file
M374 				; Save calibration data. Default is sys/heightmap.csv
M291 P"Probing mesh grid process finished !" R"Probing.." S1 T2
; Probe the bed at 4 points X-25:313 Y150:149
G30 P0 X260 Y149 H0 Z-99999
G30 P1 X30 Y150 H0 Z-99999
;G30 P2 X260 Y260 H0 Z-99999
;G30 P3 X260 Y30 H0 Z-99999 S

;G28				; home all axis bb
;G29 S0
;M374 				; Save calibration data. Default is sys/heightmap.csv

Simplify3D start script

M291 P"Homing all axis" R"Printing.." S1 T2
G21		; metric values
G28		; home all
;G29 S2		; mark if you want to disable mesh grid
G32		; Run mesh grid compenstion
G29 S0
		; Purge extruder
G92 E0 F100		; reset extruder
G1 Z10 F3000 		; move z up little to prevent scratching of surface
M98 P/macros/Filament/Purge	; Run nozzle purge macro
;G1 E-1 F2000		; Retract 1mm filament
G92 E0 		; reset extruder
M291 P"Printing started !" R"Printing.." S1 T3

Picture N°1

Picture N°2

Picture N°3

[Veti]

@Sowlan said in Bed flat at origin,inclined during prob sequence before printing:

I adding my printer have two Z axis at left & right sides,

you might want to set up
https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors

M557 X30:260 Y30:260 S80 ; define mesh grid

change S80 to S10 and see how that looks.

[Sowlan]

@Veti said in Bed flat at origin,inclined during prob sequence before printing:

https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors

Tank you for your fast answer.
Yes based on wiki I had yet make some changes in config.g for M671 (leadscrews positions) and in bed.g G30 (probe near leadscrews) but maybe you ask to me to focusing on it because my drive mapping show M584 X0 Y1 Z2 E3 and not Z2:4 for independent Z move, I'm intrigue by the fact independent Z move is here yet this's show by this problem and I the case I want static position on Z steppers I think this configuration is good. But is you are any idea about that I take it.

change S80 to S10 and see how that looks.

I had make this change but no really change

resultats:

my start test look like this

Now after press on true leveling button

and probing sequence before printing

[Veti]

@Sowlan said in Bed flat at origin,inclined during prob sequence before printing:

I had make this change but no really change

Please run Mesh bed leveling not true bed leveling.

@Sowlan said in Bed flat at origin,inclined during prob sequence before printing:

M584 X0 Y1 Z2 E3 and not Z2:4 for independent Z move

without that the duet board can not address the z steppers indepenently so true bed leveling will have no effect.

the case I want static position on Z steppers

i dont quite understand, but as soon as power is off the position can be 2 full steps out of sync.

[Sowlan]

@Veti

Please run Mesh bed leveling not true bed leveling.

Ok now I understand more clearly the difference between both fonctions. Mesh bed leveling shown me an 29G error due to S10 is too low it tell me to try it S11.5, that's result more what you went, some think look like small ski area for fourmis.

I have one G32 in my start script Simplify3D, I will delete it, leave G29 S0 and use S50 for grid mesh. and testing to print.

[Sowlan]

The problem hasn't changed

When I click on Mesh bed compensation button I have this:

and when I run printing mesh bed compensation change for that and printing result is very bad

[Sowlan]

Same test with S11.5 in M557, it's frustrating

mesh compensation without printing run

and now mesh compensation before printing

[Sowlan]

Ok now I know what is the cause of problem but don't know how repair it.
It's bed heating !!!

test with bed heating off

and now with with bed heating on at 60°C....

Now what about my materials, I using d42 IR sensor with metal plate and modified CR-10 with magnet under it. Somebody know if by reputation something provoke it magnet, hearting, electromagnetism,etc... ?

[Sowlan]

I don't Know if this problem interest any peoples but I continue to investigate...

Now I tried same test without metal plat, probing on nude surface

without metal plat and cold bed

without metal plat and hot bed at 60°C

If any body know where come from this effect I'm interesting, Maybe @dc42 how have same name than my sensor have an idea?

[dc42]

I suspect that the bed heat is causing the bed to warp. However, the large amount of variation in your height map indicates that the IR sensor does not work well with your bed surface. What is the bed made of?

[Sowlan]

@dc42

Hi thank you for you answer, I'd bought BLV kite from Bluerolls at aliexpress the bed I have is here

it's 310x310mm bed with metal plat and on the plate I have PEI protection.

Now I suspect something other, the side who falling is connector side, maybe electromagnetism from bed is the problem, I had do speed test with aluminum paper between bed and metal plate, with bed heating I view where the paper exceed out of bed mash map is relatively plate. Now I doing new test with exceed aluminum paper out of bed to view if it's that. I will be busy the next hour but I come soon with result of my test.

[Sowlan]

@dc42
Finally I have small difference but not significant difference...

With metal plate, cold bed and paper aluminum border exceed

With metal plate, hot bed at 60°C and paper aluminum border exceed