Mesh calibration not working or what am I doing wrong?

[Dep]

I heated the table. Here is the result:

RepRapFirmware height map file v2, min error -0.056, max error 1.271, mean 0.512, deviation 0.270
xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
450.00,950.00,120.00,620.00,-1.00,50.00,50.00,11,11
  0.210,  0.144,  0.077, -0.005, -0.047, -0.056,  0.005,  0.057,  0.157,  0.285,  0.423
  0.433,  0.364,  0.267,  0.133,  0.083,  0.066,  0.102,  0.179,  0.279,  0.408,  0.553
  0.664,  0.533,  0.419,  0.273,  0.207,  0.222,  0.234,  0.285,  0.372,  0.501,  0.646
  0.890,  0.709,  0.579,  0.430,  0.330,  0.267,  0.302,  0.367,  0.443,  0.563,  0.721
  1.078,  0.899,  0.713,  0.558,  0.449,  0.400,  0.405,  0.452,  0.515,  0.649,  0.782
  1.240,  1.019,  0.818,  0.627,  0.488,  0.458,  0.484,  0.534,  0.601,  0.694,  0.840
  1.271,  1.028,  0.831,  0.665,  0.538,  0.483,  0.478,  0.498,  0.598,  0.699,  0.806
  1.205,  0.980,  0.773,  0.632,  0.508,  0.471,  0.454,  0.509,  0.572,  0.698,  0.808
  1.080,  0.846,  0.679,  0.522,  0.405,  0.383,  0.417,  0.469,  0.556,  0.689,  0.792
  0.829,  0.671,  0.544,  0.382,  0.310,  0.332,  0.350,  0.437,  0.555,  0.698,  0.823
  0.687,  0.558,  0.428,  0.302,  0.217,  0.232,  0.278,  0.356,  0.468,  0.605,  0.752

And now I’ll try to print a 200 x 200 square ...

[dgrat]

M906 X1500 Y0 Z0 E1200 I100 ; Set motor currents (mA) and motor idle factor in per cent

looks weird. How does this even work? I also don't think, that test-printing makes sense currently.

M92 X100 Y160 Z1600 E157 ; Set steps per mm

I havent seen many builds like this. Can you post a photo. Why is Steps per mm all different?

[Veti]

I made a crude drawing what happens with a sagging x axis to the trigger height.
the drawing is a bit over the top, but its just to show the problem.

because of the curve created by the sagging the trigger heights varies, which causes incorrect heights to be reported.

[Dep]

@Veti Honestly, I did not understand your picture. Could be a little more detailed

[Dep]

Pictures of the result:

I should have made the bed a little lower, but it’s already clearly seen that the compensation is insufficient.

[Dep]

@dgrat said in Mesh calibration not working or what am I doing wrong?:

M906 X1500 Y0 Z0 E1200 I100

This is because the Y and Z motors are connected to an external driver.

[Veti]

@Dep
the images shows your over 1 meter long x axis.
it bends under its own weight

it shows your hotend assembly at 3 different positions.

1. at an angle in the at around 1/3 the length
2. not at an angle in the middle
3. at an angle at around 2/3 the length

because the entire hotend assembly is at an angle at position 1 and 3 the probe value will be off because in position 1 the nozzle is lower and in position 3 the nozzle is higher in comparison to the probes trigger point.

lets assume you have a trigger height of 5mm
i.e. at position 2 this is correct.
at position 1 your actual trigger height might be 6mm
at position your actual trigger height might be 4mm.

so your printer in the middle would be fine.
the further you move to the left your prints would get squashd
the further you move to the right your prints would be spaced or not stick to the bed.

p.s that bed surface looks like old scrap metal.

[Dep]

@Veti Now I understand what you mean.

I do not agree. The deflection of the extruder beam is almost zero. When it was mounted, we did a preload up. And checked on the line.

And even if there is a sag, then this is a hundredth of a millimeter.

The upper surface of the table is made of aluminum. To equalize and improve thermal conductivity, thermal grease was applied under the glass.

[fcwilt]

@Dep said in Mesh calibration not working or what am I doing wrong?:

@fcwilt
I will try to do. But it will take at least 4 hours

Thanks very much.

Frederick

[Dep]

@fcwilt Already done. Look above

[fcwilt]

@Dep said in Mesh calibration not working or what am I doing wrong?:

@fcwilt Already done. Look above

Yes. I see. Thanks very much.

I'm not sure what is going on. The numbers suggest that glass is very uneven.

The printed object seems to show extrusion problems. Around the perimeter the lines look good, even if they didn't adhere, but the infill looks strange.

The probing you did used a 50x50 (mm) grid correct?

Have you tried probing a smaller area using a 10x10 or 20x20?

I would be interested to see if such a small area exhibited the same strange numbers, when done on different areas on the glass, such as the middle versus the four corner.

Frederick

[Dep]

@Veti I just measured the deflection of the X axis in the middle and it is less than 0.1mm

You are right, this is a very interesting idea with a bltouch measurement angle! But unfortunately in this case is not applicable.

[Dep]

@fcwilt Yes, I have already tried different options. On small objects more or less. But I'm interested in a big one.

What is the use of mesh calibration if it requires a flat bed?

Maybe you will try to lower the one corner of the bedon on your printer by 2-3mm and try to print something. Will calibration work?

I think not.

[dgrat]

This post is deleted!

[tarantul]

Same problem, Duet2 WiFi. Pretending to compensate, but in fact there is no compensation.

M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.04RC1 running on Duet WiFi 1.02 or later
Board ID: 08DGM-917DA-G4MSD-6JTDA-3SN6T-TSTV8
Used output buffers: 3 of 24 (15 max)
=== RTOS ===
Static ram: 25680
Dynamic ram: 93784 of which 276 recycled
Exception stack ram used: 516
Never used ram: 10816
Tasks: NETWORK(ready,508) HEAT(blocked,1236) MAIN(running,3772) IDLE(ready,160)
Owned mutexes:
=== Platform ===
Last reset 00:17:30 ago, cause: software
Last software reset at 2019-11-04 18:09, reason: User, spinning module GCodes, available RAM 10792 bytes (slot 2)
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
Error status: 0
Free file entries: 9
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 2.8ms, max retries 0
MCU temperature: min 28.3, current 28.9, max 29.3
Supply voltage: min 25.6, current 25.9, max 26.3, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: standstill, SG min/max 0/217
Driver 1: standstill, SG min/max 0/1023
Driver 2: standstill, SG min/max 43/271
Driver 3: standstill, SG min/max not available
Driver 4: standstill, SG min/max not available
Date/time: 2019-11-04 18:26:41
Cache data hit count 3800896749
Slowest loop: 17.34ms; fastest: 0.08ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Move ===
Hiccups: 0, FreeDm: 169, MinFreeDm: 166, MaxWait: 987376ms
Bed compensation in use: mesh, comp offset 0.000
=== DDARing ===
Scheduled moves: 58, completed moves: 58, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
=== GCodes ===
Segments left: 0
Stack records: 3 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is idle in state(s) 0
serial is idle in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 203.14ms; fastest: 0.08ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
HTTP sessions: 1 of 8
- WiFi -
Network state is running
WiFi module is connected to access point 
Failed messages: pending 0, notready 0, noresp 1
WiFi firmware version 1.23
WiFi MAC address ec:fa:bc:2d:df:7b
WiFi Vcc 3.47, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 25704
WiFi IP address 192.168.1.53
WiFi signal strength -45dBm, reconnections 0, sleep mode modem
Socket states: 0 0 0 0 0 0 0 0

Config.g

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Tue Oct 09 2018 13:27:56 GMT+0300

; 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 PBLV mgn Cube                                 ; Set machine name
M552 S1                                            ; Enable network
M587 S"xxxx" P"xxxx" I192.168.1.53 J192.168.1.1 K255.255.255.0     		   ; 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 backwards blv: its was S1
M569 P1 S0                                         ; Drive 1 goes backwards blv: its was S1
M569 P2 S1                                         ; Drive 2 goes forwards
M569 P3 S1                                         ; Drive 3 goes backwards WAS 0
M350 X16 Y16 Z16 E16 I1                            ; Configure microstepping with interpolation
M92 X200 Y200 Z400 E408                            ; Set steps per mm for Bondtech. E405.18
M566 X600 Y600 Z24 E300                            ; Set maximum instantaneous speed changes (Jerk) (mm/min)  M566 X600 Y600 Z24 E300   
M203 X20000 Y20000 Z600 E2000                      ; Set maximum speeds (mm/min) 
M201 X3000 Y3000 Z100 E5000			   ; Set accelerations (mm/s^2)
M906 X1500 Y1500 Z1500 E1100 I30                   ; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                            ; Set idle timeout

; Pressure advance
M572 D0 S0.065					   ; disabled Pressure advance

; Axis Limits
M208 X-23 Y0 Z0 S1                                 ; Set axis minima
M208 X320 Y321 Z350 S0                             ; Set axis maxima

; Endstops
M574 X1 Y2 S1                                      ; Set active high endstops edit: Y endstop is high(max).

; Z-Probe
M574 Z1 S2                                         ; Set endstops controlled by probe
M307 H1 A429.0 C107.7 D7.0 V23.8 B0
M307 H0 A68.5 C499.3 D2.7 V23.8 B0		   ; Set PID for heated bed values
M307 H3 A-1 C-1 D-1                                ; BLTouch configure
M558 P9 H5 F200 T8000			           ; Set Z probe type BLTouch sensor
M280 P3 S160 I1                                    ; BLTouch alarm release and pin UP

G31 P25 X27 Y-10 Z2.56                               ; BLTouch sensor ;Z2.63 - ABS
M376 H5


; Heaters
M305 P0 T100000 B3950 C0 R4700                     ; Set thermistor + ADC parameters for heater 0
M143 H0 S140                                       ; Set temperature limit for heater 0 to 100C
M305 P1 T100000 B3950 C0 R4700
M143 H1 S290                                       ; Set temperature limit for heater 1 to 260C

; 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 T50                          ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T50                          ; Set fan 2 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 power saving
M911 S21 R22 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

bed.g

; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool on Tue Oct 09 2018 13:27:56 GMT+0300
M291 P"Probing mesh grid process started" R"Probing.." S1 T2
M561               		; clear any bed transform
G28				; home all axis bb
M564 S0

G90 				; absolute positioning bb
; Define mesh grid
M557 X30:270 Y30:270 S80:80   ; 16 points

;M557 X30:270 Y30:270 S240:240   ;4 points


G29 S0				; Probe the bed and save height map to file
G29 S1

homeall.g

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool on Tue Oct 09 2018 13:27:56 GMT+0300

G91                     ; relative positioning
G1 Z5 F6000 S2          ; lift Z relative to current position
G1 S1 X-355 Y355 F6000  ; move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-355             ; home X axis
G1 S1 Y355              ; home Y axis
G1 X5 Y-5 F6000         ; go back a few mm
G1 S1 X-355 F360        ; move slowly to X axis endstop once more (second pass)
G1 S1 Y355              ; then move slowly to Y axis endstop
G90                     ; absolute positioning
G1 X152 Y166.4 F6000 	; go to first bed probe point and home Z
G30                     ; home Z by probing the bed

homez.g

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool on Tue Oct 09 2018 13:27:56 GMT+0300

G91                 ; relative positioning
G1 Z5 F6000 S2      ; lift Z relative to current position
G90                 ; absolute positioning
G1 X152 Y166.4 F6000 ; go to first probe point
G30                 ; home Z by probing the bed

[fcwilt]

@Dep said in Mesh calibration not working or what am I doing wrong?:

What is the use of mesh calibration if it requires a flat bed?

It doesn't require a flat bed but it does mean there is less Z adjustment required.

I'm not fully convinced it is a mesh compensation problem. Which is why I asked about using a tight grid (10x10 or 20x20) to probe those different areas of the bed.

I would like to know if the strange numbers you are getting will show up in all regions of the bed. If they did it would suggest something else is going.

Maybe you will try to lower the one corner of the bedon on your printer by 2-3mm and try to print

I would but the range of adjustment for my printer is small.

Frederick

[Lc1975]

@tarantul

Bed compensation in use: none, comp offset 0.000

Is that correct?

Mine says
Bed compensation in use: mesh, comp offset 0.000

(manual bed levelling)

[Dep]

My M122 after new test.

M122
=== Diagnostics ===
RepRapFirmware for Duet version 1.25RC4 running on Duet 0.85
Used output buffers: 3 of 16 (9 max)
=== System ===
Static ram: 44204
Dynamic ram: 42620 of which 3288 recycled
Stack ram used: 136 current, 4132 maximum
Never used ram: 4060
=== Platform ===
Last reset 03:48:05 ago, cause: power up
Last software reset at 2019-11-01 19:24, reason: User, spinning module GCodes, available RAM 4060 bytes (slot 2)
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0400f000 BFAR 0xe000ed38 SP 0xffffffff
Error status: 0
Free file entries: 10
SD card 0 detected, interface speed: 21.0MBytes/sec
SD card longest block write time: 31.2ms, max retries 0
MCU temperature: min 44.8, current 53.1, max 55.4
Date/time: 2019-11-04 18:26:58
Slowest loop: 283.88ms; fastest: 0.10ms
I2C nak errors 768, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 768
=== Move ===
Hiccups: 68, FreeDm: 100, MinFreeDm: 88, MaxWait: 5296105ms
Bed compensation in use: mesh, comp offset 0.000
=== DDARing ===
Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
=== Heat ===
Bed heaters = 2, chamberHeaters = 0 -1
Heater 1 is on, I-accum = 0.3
=== GCodes ===
Segments left: 0
Stack records: 2 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is idle in state(s) 0
serial is idle in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Free connections: 15 of 16
Free transactions: 23 of 24
Locked: 0, state: 4, listening: 20071bf4, 0, 0

I don’t think skipping Z steps, because I have a servo stepper motor on Z.

[tarantul]

@Lc1975 said in Mesh calibration not working or what am I doing wrong?:

@tarantul

Bed compensation in use: none, comp offset 0.000

Is that correct?

Mine says
Bed compensation in use: mesh, comp offset 0.000

(manual bed levelling)

I fixed the message .. I wrote the last output here right after the printer was loaded .. now I executed G32 and then M122

[Veti]

@tarantul said in Mesh calibration not working or what am I doing wrong?:

M557 X30:270 Y30:270 S80:80 ; 16 points

far to few probing points.