have problems with mesh bed leveling

lui2004

i have problems to level my bed

Z-Probe: Piezo Orion
E3d V6 Original ( no Clone )

manual bed leveling give me this as output

17:23:19G32
Manual corrections required: 0.00 turn up (0.00mm) 0.00 turn down (0.00mm) 0.0 turn up (0.00mm)

seems perfect or not ?

but after i run G29

i got this as output

i try since hours to get it flat but no chance

anyone can help me

if you nedd my configs please tell me i will reply

thanks

fcwilt

Hi,

Can you run G29 using the same 3/4 points you use for the manual bed leveling procedure?

I would do it just to be sure you get the same results - perfectly level.

Frederick

lui2004

if you explain how i can do that

thats my bed.g

;M561 ; clear any bed transform
;G28 ; home
;M401 ; deploy Z probe
;G30 P0 X215 Y210 Z-99999 ; probe near an adjusting screw
;G30 P1 X215 Y9 Z-99999 ; probe near an adjusting screw
;G30 P2 X5 Y114 Z-99999 S3 ; probe near an adjusting screw and report adjustments needed
;M402 ; retract probe

droftarts

I'm not quite sure why you have a bulge in the bed (possibly expansion due to heating?) but you do have a 'tramming' issue. This is shown by, on the left of your bed map, the high point at the front and the low point at the back, while on the right it is relatively level. This means that your Y axis smooth rods are not level. Assuming this is a cartesian printer with a bed that moves in Y, which most likely has four feet, and is not sat on a flat surface, so one corner of your printer is lifted. The easiest fix for this is to put a shim (folded piece of paper, 1mm thick) under the front left foot of the printer.

To resolve other issues we'll need to know more about the printer; type and construction of heated bed, layout of rods etc. Or post a picture of it.

Ian

lui2004

this is my printer

my config.g

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Thu Apr 11 2019 17:51:12 GMT+0200 (Mitteleuropäische Sommerzeit)

; General preferences
G90                                      ; Send absolute coordinates...
M83                                      ; ...but relative extruder moves

; Network
M550 P"AM8"                              ; Set machine name
M552 S1                                  ; Enable network
M587 S"+++++" P"++++++"  ; Configure access point. You can delete this line once connected
M586 P0 S1                               ; Enable HTTP
M586 P1 S0                               ; Disable FTP
M586 P2 S0                               ; Disable Telnet

; Drives
M569 P0 S0                               ; Drive 0 goes forwards X
M569 P1 S0                               ; Drive 1 goes forwards Y
M569 P2 S1                               ; Drive 2 goes backwards Z
M569 P3 S1 				 ; Drive 3 goes forwards Extruder
M569 P4 S1 			         ; Drive 4 2nd Z-motor - Normally used as Extruder 1

; Motor Remapping
M584 X0 Y1 Z2:4 E3	; two Z motors connected to driver outputs Z and E1



M350 X16 Y16 Z16 E16 I1                  ; Configure microstepping with interpolation
M92 X100.12 Y99.35 Z408.16 E396.24      ; Set steps per mm
M566 X600.00 Y600.00 Z18.00 E300.00      ; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z450.00 E6000.00  ; Set maximum speeds (mm/min)
M201 X1500.00 Y1500.00 Z450.00 E10000.00 ; Set accelerations (mm/s^2)
M906 X1400.00 Y1400.00 Z1400.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                  ; Set idle timeout

; Axis Limits
;M671 X-15:205:205 Y105:205:15 P0.5   ; für manual bed levelling

;M671 X-15:100:215 Y190:-10:190 P0.5 ; adjusting screws at rear left (-15,190), front middle (100,-10) and rear right (215,190), thread pitch 0.5mm
M671 X-33:220 Y0:0 S0.5 		 ; leadscrews at left and right of X axis für 2 motoren
M208 X-33 Y-10 Z0 S1                     ; set axis minima
M208 X220 Y220 Z240 S0                   ; set axis maxima


; Endstops
M574 X1 Y1 S0                            ; Set active low and disabled endstops

; Z-Probe
M574 Z1 S2                               ; Set endstops controlled by probe
M558 P5 I1 R0.4 F420 X0 Y0 Z0			 ; Set Z probe type to effector and the dive height + speeds
G31 X0 Y0 Z0 P100                      ; Set Z probe trigger value, offset and trigger height 
M557 X20:200 Y20:200 S40                 ; define mesh grid


; Heaters
;M307 H0 B0 S1.00                         ; Disable bang-bang mode for the bed heater and set PWM limit
;M307 H0 A78.5, C355.9, D1.0	          ; Pid Tuining BED
;M143 H0 S130                             ; Set temperature limit for heater 0 to 130C

M305 P0 T100000 B4138 R4700              ; Set thermistor + ADC parameters for heater 0
M143 H0 S120                             ; Set temperature limit for heater 0 to 120C


M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S275                             ; Set temperature limit for heater 1 to 275C
M307 H1 A224.6, C134.6, D5.3 S1		 ; Pid Tuning -nozzle

; Fans
M106 P0 S0 I0 F500 H-1                   ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45                ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1                            ; 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

; Automatic saving after power loss is not enabled

; Custom settings are not configured

; Miscellaneous
T0                                       ; Select first tool
M501

fcwilt

@lui2004

Why are all of the commands in your bed.g commented out?

As to getting G29 to do a simplified 4 point probe try M557 X5:215 Y9:210 P2.

Those values are determined by the values in your bed.g file. In that file you specify the first two points as X215,Y210 and X215,Y9 with the X of the third point as X5. So I am using the X range (5 to 215) and the Y range (9 to 210) to specify the four points of a rectangle which would give you a simplified height map showing just the overall levelness of the bed.

Now I don't recall if the M557 command needs to be set taking into account the probe offset or not.

I don't use the bed leveling assistant as I find it hard to turn the adjustment screws just the amount reported.

I just use G29 with 4 point probing near the corners of the bed. Then I can look at the values reported in the height map and tweak the adjustment screws. It takes a number of runs of G29 but I find that I can get the four points adjusted within 0.005 mm easily and within 0.001 mm with a bit more work.

One I have the bed leveled to my satisfaction then I use G29 with multi-point probing to determine the actual mesh compensation to use during printing.

Frederick

lui2004

i still try it

thanks

lui2004

it seems almost perfect

epRapFirmware height map file v2 generated at 2019-10-03 19:25, min error 0.000, max error 0.017, mean 0.009, deviation 0.008
xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
5.00,215.00,9.00,210.00,-1.00,210.00,201.00,2,2
  0.017,  0.000
  0.017,  0.002

fcwilt

Hi,

Were you actually running the bed.g file with all of the commands commented out?

Frederick

lui2004

my bed.g is like this:

;; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool v2 on Mon Apr 29 2019 10:01:00 GMT+0200 (Mitteleuropäische Sommerzeit)

M561 ; clear any bed transform
G28 ; home
M401 ; deploy Z probe
G30 P0 X215 Y210 Z-99999 ; probe near an adjusting screw
G30 P1 X215 Y9 Z-99999 ; probe near an adjusting screw
G30 P2 X5 Y114 Z-99999 S3 ; probe near an adjusting screw and report adjustments needed
M402 ; retract probe

lui2004

G29 with multi-point probing i got this output

T3P3Tony

If you compare the simple 4 points, with the multi point it certainly looks like your bed has a huge bulge. try rotating the surface or flipping it over to confirm it is a physical issue with the bed surface.

lui2004

ok shit

can you recommend me a good bed ?

lui2004

today i have changed the bed and all is flat

now,what i do first before i start print?
G29 S1 ; Load Mesh
G32 to Level the 2 independend Z-Motors

and the start print is correct ? if yes my prints starts over the air if do this

fcwilt

@lui2004

Well for my DBOT equipped with 3 Z-axis steppers and I am leveling the bed and/or creating the height map as separate operations via Macros

For printing I:

warm the bed and extruder heater for several minutes
home all
set the "Z=0 Datum" using the Z-probe
load the height map
begin print

Frederick

lui2004

for Simplify3d in Endscript is the code like this ?

G28 ; home all axis
G1 X110 Y110 ; Go to Center
G30 ; Z=0 Datum
G29 S1 ; Load Mesh

fcwilt

@lui2004

The only gcode I have in S3D is to use M98 to invoke two macros, print_begin.g and print_end.g

Frederick

lui2004

Hi

i have never used macros, can you explain me ho to use it ?

thanks a lot for your help

grizewald

@lui2004 said in have problems with mesh bed leveling:

Hi

i have never used macros, can you explain me ho to use it ?

thanks a lot for your help

A macro is just a file containing G-codes. You use M98 P"macro filename" to run a macro by name.

They are great for putting the code for a specific function which you might want to run from various places in one file so there's only one file to edit when you need to change things.

For example, you could have the code needed to home your X, Y and Z axes repeated in both homeall.g and the individual home macros. Or, you could just call the individual home macros from homeall.g

lui2004

ok nice !

for example for z=Datum

Zdatum.g

G1 X110 Y110 ; Go to bed center
G30 ; Probe once

and then i can insert in Simplify3d in Startscript

M98 Zdatum.g

is it correct ?