Mesh bed compensation

Heide

I'm having problems with Mesh Bed Compensation.

It simple does not make the compensation on the hole bed, it only uses half the bed to compensate on?

Does anyone have an idea about what is going on.

I have just taken this screenshot

Here are a previous hightmap

RepRapFirmware height map file v2 generated at 2022-04-03 21:40, min error 0.365, max error 2.213, mean 1.158, deviation 0.407
axis0,axis1,min0,max0,min1,max1,radius,spacing0,spacing1,num0,num1
X,Y,15.00,270.00,15.00,240.00,-1.00,20.00,20.00,13,12
      0,      0,      0,      0,      0,  2.213,  1.905,  1.568,  1.355,  1.145,  0.830,  0.528,  0.365
      0,      0,      0,      0,      0,  2.098,  1.828,  1.560,  1.335,  1.130,  0.875,  0.565,  0.395
      0,      0,      0,      0,      0,  2.007,  1.770,  1.477,  1.312,  1.142,  0.882,  0.643,  0.463
      0,      0,      0,      0,      0,  1.945,  1.707,  1.480,  1.278,  1.115,  0.858,  0.675,  0.490
      0,      0,      0,      0,      0,  1.902,  1.668,  1.453,  1.270,  1.130,  0.910,  0.723,  0.553
      0,      0,      0,      0,      0,  1.805,  1.600,  1.408,  1.215,  1.100,  0.890,  0.735,  0.562
      0,      0,      0,      0,      0,  1.725,  1.565,  1.395,  1.202,  1.098,  0.933,  0.795,  0.638
      0,      0,      0,      0,      0,  1.640,  1.515,  1.318,  1.205,  1.095,  0.955,  0.820,  0.690
      0,      0,      0,      0,      0,  1.553,  1.433,  1.255,  1.183,  1.072,  0.930,  0.805,  0.695
      0,      0,      0,      0,      0,  1.477,  1.362,  1.247,  1.150,  1.050,  0.928,  0.830,  0.725
      0,      0,      0,      0,      0,  1.400,  1.300,  1.192,  1.115,  1.035,  0.930,  0.840,  0.760
      0,      0,      0,      0,      0,  1.320,  1.235,  1.138,  1.090,  1.028,  0.942,  0.860,  0.793

And here are the Config.g

; Configuration file for Duet 3 (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Sun Mar 27 2022 12:01:23 GMT+0200 (Centraleuropæisk sommertid)

; General preferences
M575 P1 S1 B57600                                     ; enable support for PanelDue
G90                                                   ; send absolute coordinates...
M83                                                   ; ...but relative extruder moves
M550 P"Heides Printer"                                ; set printer name
M669 K1                                               ; select CoreXY mode

; Wait a moment for the CAN expansion boards to start
G4 S2

; Network
M552 P192.168.0.110 S1                                ; enable network and set IP address
M586 P0 S1                                            ; enable HTTP
M586 P1 S0                                            ; disable FTP
M586 P2 S0                                            ; disable Telnet

; Drives
M569 P1.0 S1                                          ; physical drive 1.0 goes forwards A
M569 P1.1 S1                                          ; physical drive 1.1 goes forwards B
M569 P0.1 S1                                          ; physical drive 0.1 goes Forwards Z1
M569 P0.0 S1                                          ; physical drive 0.0 goes forwards E
M569 P0.2 S0                                          ; physical drive 0.2 goes backwards Z2
M569 P0.3 S1                                          ; physical drive 0.3 goes forwards Z3
M569 P0.4 S0                                          ; physical drive 0.1 goes backwards Z4
M584 X1.0 Y1.1 Z0.1:0.2:0.3:0.4 E0.0                  ; set drive mapping
M350 X16 Y16 Z16 E16 I1                               ; configure microstepping with interpolation
M92 X82.1328 Y82.133 Z400 E397.00                      ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00                   ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00               ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00                   ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30                          ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                               ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                                      ; set axis minima limits
M208 X275 Y275 Z275 S0                                ; set axis maxima limits

; Endstops
M574 X2 S1 P"!io1.in"                                 ; configure switch-type (e.g. microswitch) endstop for high end on X via pin !io1.in
M574 Y2 S1 P"!io2.in"                                 ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin !io2.in
M574 Z1 S2                                            ; configure switch-type (e.g. microswitch) endstop for low end on Z via pin io5.in

; Z-Probe
M558 P5 C"io4.in" H5 F120 T6000                       ; set Z probe type to switch and the dive height + speeds
M558 H30                                              ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
G31 P500 X100 Y0 Z-0.30                                ; set Z probe trigger value, offset and trigger height
M557 X15:260 Y15:240 S20                              ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B3950          ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                                    ; create bed heater output on out0 and map it to sensor 0
M307 H0 R0.753 K0.444:0.000 D3.45 E1.35 S1.00 B0      ; disable bang-bang mode for heater and set PWM limit 
M140 H0                                               ; map heated bed to heater 0
M143 H0 S120                                          ; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                                    ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 R3.751 K0.520:0.000 D1.88 E1.35 S1.00 B0 V23.8; disable bang-bang mode for heater and set PWM limit 
M143 H1 S300                                          ; set temperature limit for heater 1 to 300C

; Fans
M950 F0 C"out4" Q500                                  ; create fan 0 on pin out4 and set its frequency
M106 P1 S1 I0 H1 T150                                        ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out5" Q500                                  ; create fan 1 on pin out5 and set its frequency
M106 P1 S1 I0 H1 T50                                  ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"out7" Q500                                  ; create fan 2 on pin out7 and set its frequency
M106 P2 T45:65 F50 H-1                                ; set fan 2 value. Thermostatic control is turned off
M950 F3 C"out8" Q500                                  ; create fan 3 on pin out8 and set its frequency
M106 P3 T45:65 F50 H-1                                ; set fan 3 value. Thermostatic control is turned off

; Tools
M563 P0 D0 H1 F-1                                     ; 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
T0                                                    ; select first tool

I hope that there is an explanation to this.

fcwilt

@heide

Your probe X offset from G31 is specified as 100 . You have to take that into account when specifying where to probe.

Your axis X min value from M208 is specified as 0.

Your probing grid X min value from M557 is specified as 15.

To move the probe to X = 15 means moving the nozzle to X = -85, which is not possible given the X min value from M208.

Is your probe really 100mm to the right of the nozzle? That is a very large value.

Frederick

Heide

@fcwilt No the probe is not 100 mm. from the nozzle. I have now changes that to x = 15 mm, and Y = 20 mm. Is it very importent that it is precise?
It is some confusing with the + and the -.

I have now altered the coordinates, and will start it up again, to see if that helped

Heide

@fcwilt When you read the hightmap, is the numbers off or is it normal?

fcwilt

@heide said in Mesh bed compensation:

Is it very importent that it is precise?

It should be easy to get within a mm or two.

It is some confusing with the + and the -.

Assuming X increases as you move to the right and Y increases as you move to the rear:

For X, + is to the right of the nozzle, - is to the left.

For Y, + is to the rear of the nozzle, - is to the front.

Frederick

fcwilt

@heide said in Mesh bed compensation:

@fcwilt When you read the hightmap, is the numbers off or is it normal?

Hard to tell with an incomplete height map.

If you post your actual height map file (the .CSV file) we can load it and look at the 3D image.

Or you can take a screen shot of the 3D image and post that.

Frederick

Heide

@fcwilt here it is

I still need some tweeking, but almost complete. I will make a new one tomorrow. I will adjust accoring to your explanation. Thanks

RepRapFirmware height map file v2 generated at 2022-04-04 20:58, min error -0.880, max error 2.263, mean 0.810, deviation 0.709
axis0,axis1,min0,max0,min1,max1,radius,spacing0,spacing1,num0,num1
X,Y,0.00,270.00,0.00,240.00,-1.00,20.00,20.00,14,13
      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0
      0,  2.263,  2.043,  1.743,  1.447,  1.213,  0.913,  0.627,  0.383,  0.125, -0.110, -0.465, -0.785, -0.880
      0,  2.207,  1.983,  1.760,  1.435,  1.195,  0.965,  0.688,  0.438,  0.215, -0.005, -0.305, -0.615, -0.757
      0,  2.155,  1.950,  1.703,  1.398,  1.205,  0.980,  0.735,  0.490,  0.260,  0.075, -0.235, -0.510, -0.667
      0,  2.078,  1.885,  1.642,  1.388,  1.160,  0.978,  0.765,  0.518,  0.323,  0.178, -0.145, -0.397, -0.525
      0,  1.983,  1.820,  1.628,  1.388,  1.205,  1.015,  0.785,  0.562,  0.390,  0.235, -0.027, -0.300, -0.428
      0,  1.945,  1.780,  1.553,  1.375,  1.215,  1.005,  0.825,  0.615,  0.420,  0.268, -0.027, -0.207, -0.342
      0,  1.855,  1.693,  1.540,  1.308,  1.148,  0.993,  0.843,  0.655,  0.500,  0.358,  0.103, -0.075, -0.182
      0,  1.767,  1.648,  1.470,  1.305,  1.148,  1.040,  0.892,  0.735,  0.582,  0.442,  0.255,  0.068, -0.055
      0,  1.668,  1.575,  1.443,  1.257,  1.160,  1.030,  0.895,  0.763,  0.625,  0.510,  0.345,  0.173,  0.058
      0,  1.580,  1.485,  1.355,  1.240,  1.130,  1.013,  0.885,  0.765,  0.648,  0.543,  0.405,  0.245,  0.175
      0,  1.513,  1.425,  1.320,  1.210,  1.105,  1.005,  0.898,  0.793,  0.690,  0.610,  0.490,  0.350,  0.295
      0,  1.425,  1.358,  1.263,  1.168,  1.092,  1.005,  0.910,  0.815,  0.730,  0.663,  0.567,  0.447,  0.408

fcwilt

@heide

What sort of printer do you have?

The numbers suggest the bed is not level.

Usually you want to level the bed as best as possible and only rely on mesh bed compensation to deal with bed irregularities.

Frederick

Heide

@fcwilt It is a Voron 2.4

fcwilt

@heide

It appears to have bed leveling adjusters.

Have you tried to level the bed using them?

Frederick

Heide

@fcwilt There are no adjusters. But I kan dissasemble the bed and adjust with shims. I have done that a couple of times. But it seems that I didn't take the Gantry in count. It also needs to be levelled. Or mayby I misunderstand that. I have browsed the internet, and I still needs to read up on the method, to figure out how to get the gantry to be even. I would like to at a tight setup, with no compensation, but that must be in a dream world I will hit the sheets now, and get back tomorrow

Heide

@fcwilt I have now adjusted the config.g and it works. I stille need to level the bed by hand, but that must be later on.

Please mark it as solved and thank you very much for your help

fcwilt

@heide said in Mesh bed compensation:

@fcwilt I have now adjusted the config.g and it works. I stille need to level the bed by hand, but that must be later on.

Please mark it as solved and thank you very much for your help

Glad to hear you got it working and I am glad I was able to help.

Frederick

Solved Mesh bed compensation