Problems with Bed Leveling , need some help to understand

lui2004

Hi

i have the Duet Wifi with latest Firmware.
On my Cartesian 3d-Printer

Z-Probe with Piezo Orion

i use 2 independet Z-Motors

Thats my bed Levelig with 4 point at each Corner

this 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"WLAN-110995" P"3951006964710671890"  ; 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 S0 				 ; 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 X100.00 Y100.00 Z400.00 E407.92	; set steps per mm
M566 X600.00 Y600.00 Z120.00 E300.00      ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z600.00 E6000.00  ; set maximum speeds (mm/min)
M201 X1500.00 Y1500.00 Z240.00 E10000.00 ; set accelerations (mm/s^2)
M906 X1400.00 Y1400.00 Z1400.00 E1120.00 I30            ; set motor currents (mA) and motor idle factor in per cent
M84 S30  ; Set idle timeout                             ; Set idle timeout


; Axis Limits
M671 X-106:106 Y0:0 S0.5 		 ; leadscrews at left and right of X axis für 2 motoren
M208 X-129 Y-121 Z0 S1                   ; set axis minima
M208 X120 Y110 Z240 S0                   ; set axis maxima

; Endstops
M574 X1 Y1 S0                            ; Set active low and disabled endstops
M574 Z1 S2                               ; Set endstops controlled by probe

; Z-Probe
M558 P1 I1 H5 R0.5 F420 T6000			 ; Set Z probe type to effector and the dive height + speeds
G31 P545 X0 Y0 Z-0.142                      ; Set Z probe trigger value, offset and trigger height 
;M557 X-104:106 Y-99:99 S40                 ; define mesh grid
M557 X-104:106 Y-99:99 P2                     ; 4 Punkte Bett Leveln


; 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 S250                             ; 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

height map 4 Points:

RepRapFirmware height map file v2 generated at 2019-12-22 12:32, min error -0.008, max error 0.005, mean -0.001, deviation 0.005
xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
-104.00,106.00,-99.00,99.00,-1.00,210.00,198.00,2,2
  0.002,  0.005
 -0.003, -0.008

looks ok for me

thats my bed with 30 Points

RepRapFirmware height map file v2 generated at 2019-12-22 12:36, min error -0.035, max error 0.055, mean 0.006, deviation 0.022
xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
-104.00,106.00,-99.00,99.00,-1.00,40.00,40.00,6,5
  0.030,  0.010, -0.005, -0.000,  0.010,  0.042
  0.030,  0.010, -0.005, -0.010, -0.005, -0.000
  0.015, -0.003, -0.023, -0.035, -0.030, -0.025
  0.015, -0.000, -0.023, -0.018, -0.005,  0.007
  0.032,  0.025,  0.022,  0.030,  0.037,  0.055

the first layer prints in the air

i do first:

Home X and Y axis
Go to the middle of bed and do G30
G32 to level 2 independet 2 Z Motors
and then i print

my home 0,0 is in the middle of my bed

is this correct or i make errors ?

i hope someone can help me

thanks

Veti

try
homeall
g32
homez
then g29

but if the print is in the air, you will need to adjust the z trigger height of your probe.
adjust with babystepping until you get a good first layer, then change the offset by the babystepping ammount.

M671 X-106:106 Y0:0 S0.5 ; leadscrews at left and right of X axis für 2 motoren
M557 X-104:106 Y-99:99 P2 ; 4 Punkte Bett Leveln

The location of the leadscrews seem wrong, that would put them inside your probing area.

lui2004

sorry for late answer

i have try but it is still the same issue with mesh

4 point:

and the 36 Point mesh

whats the problem here ? why the bed is not flat like the 4 point ?

thanks

jens55

A 4 point mesh will always be flat as the controller connects the 4 points with straight lines. It does not represent the true shape of the bed.
I would be VERY happy with a bed as flat as the one shown with 36 points !!!