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Changing Z offset with BLTouch

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  • undefined
    cbrunnem2
    last edited by 30 Dec 2023, 07:38

    i am having issues with my initial layer z offset. i use g30 s-1 to get the probe offset and no matter what/when, its always about 4.1mm. that is what i have in my config.g

    where the problem comes in is that when i print, i have to babystep to get my initial layer to stick. the amount i have to change it varies a lot and rapidly.

    Example 1:
    i can start a print at a -.8mm offset and it will print very well. i can then try to reprint and will have to adjust the offset to -1.3 or somewhere in between. nothing changes in between.

    Example 2:
    i can start a print and get a -.8mm offset, then pause the print, resume and the offset is no longer correct.

    Things i have checked:

    1. bed is not lose
    2. extruder is not lose
    3. the z motors do not seem to be skipping
    4. bltouch seems to be working fine as no matter what, G30 s-1 results in 4.1mm
    5. bltouch mount is solid as well.

    Info about printer:
    print is a customer corexy printer with dual z axis motors for bed leveling. Bltouch for bed meshing. this issue has always been a thing but before, i didnt have to change the offset much between prints.

    im at a lose at what to do. ideas?

    config.g files

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.2.3 on Wed Jul 21 2021 18:08:02 GMT-0400 (Eastern Daylight Time)
    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"My Printer" ; set printer name
    M669 K1 ; select CoreXY mode
    ; Network
    M552 S1 ; enable network
    M586 P0 S1 ; enable HTTP
    M586 P1 S0 ; disable FTP
    M586 P2 S0 ; disable Telnet
    ; Drives
    M569 P0 S1 ; physical drive 0 goes backwards
    M569 P1 S1 ; physical drive 1 goes backwards
    M569 P2 S1 ; physical drive 2 goes forwards
    M569 P3 S1 ; physical drive 3 goes forwards
    M569 P4 S1 ; physical drive 4 goes forwards
    M584 X0 Y1 Z2:4 E3 ; set drive mapping
    M671 X200:200 Y-133:567 S15 ; locations of lead screws relative to 0:0
    M350 X16 Y16 Z16 E64 I1 ; configure microstepping without interpolation
    M92 X80 Y80.00 Z400 E391 ; set steps per mm
    M566 X10 Y10 Z300 E600 ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y180000.00 Z600 E4800.00 ; set maximum speeds (mm/min)
    M201 X2000 Y2000 Z100 E1000 ; set accelerations (mm/s^2)
    M906 X1500 Y1500 Z800 E1500 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S50 ; Set idle timeout
    ; Axis Limits
    M208 X0 Y0 Z-2.0 S1 ; set axis minima
    M208 X350 Y350 Z400 S0 ; set axis maxima
    ; 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
    M574 Z1 S2 ; configure Z-probe endstop for low end on Z
    ; Z-Probe
    M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
    M558 P9 C"^zprobe.in" H5 F100 T12000 R.1 ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X27.6 Y18.7 Z4.1 ; set Z probe trigger value, offset and trigger height Z1.92 for .8mm nozzle 1.99 for .8mm nozzle
    M557 X25:175 Y25:175 S25 ; define mesh grid
    ; Heaters
    ;M140 H-1 ; disable heated bed (overrides default heater mapping)
    M308 S0 P"e0temp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin e0temp
    M950 H0 C"e0heat" T0 ; create nozzle heater output on e0heat and map it to sensor 0
    M307 H0 B0 R1.857 C155.2 D5.66 S1.00 V24.1 ; disable bang-bang mode for heater and set PWM limit
    M143 H0 S300 ; set temperature limit for heater 0 to 300C
    M308 S1 P"bedtemp" Y"thermistor" T25000 B3950 ; configure sensor 1 as PT1000 on pin bedtemp
    M950 H1 C"bedheat" T1 ; create bed heater output on bedheat and map it to sensor 1
    M307 H1 B0 R0.757 C145.9 D1.90 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
    M140 H1 ; map heated bed to heater 1
    M143 H1 S125 ; set temperature limit for heater 1 to 300C
    ; Fans
    M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S1 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 H0 T60 ; set fan 1 value. Thermostatic control is turned off
    ; Tools
    M563 P0 D0 H0 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
    M955 P0 I45 C"spi.cs3+spi.cs4"

    bed.g

    ; bed.g
    ; called to perform automatic bed compensation via G32
    ;
    ; generated by RepRapFirmware Configuration Tool v3.2.3 on Wed Jul 21 2021 18:08:02 GMT-0400 (Eastern Daylight Time)
    M561 ; clear any bed transform
    ;G28 ;
    G30 P0 X100 Y20 Z-99999 ; probe near a leadscrew, half way along Y axis
    G30 P1 X100 Y180 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors
    G30 P0 X100 Y20 Z-99999 ; probe near a leadscrew, half way along Y axis
    G30 P1 X100 Y180 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors
    G29 ; probe the bed and enable compensation

    homez.g

    ; homez.g
    ; called to home the Z axis
    ;
    ; generated by RepRapFirmware Configuration Tool v3.2.3 on Wed Jul 21 2021 18:08:02 GMT-0400 (Eastern Daylight Time)
    G91 ; relative positioning
    G1 H2 Z5 F3600 ; lift Z relative to current position
    G90 ; absolute positioning
    G1 X100 Y100 F3600 ; go to first probe point
    G30 ; home Z by probing the bed
    G32 ;
    g30 s-1;
    G29 s1;
    ; Uncomment the following lines to lift Z after probing
    ;G91 ; relative positioning
    ;G1 Z2 F100 ; lift Z relative to current position
    ;G90 ; absolute positioning
    undefined undefined 2 Replies Last reply 30 Dec 2023, 13:15 Reply Quote 0
    • undefined
      BoA @cbrunnem2
      last edited by BoA 30 Dec 2023, 13:15

      @cbrunnem2 Did you run mech bed to get proper height map? How does it look like ?
      G29 on bed heated to printing temp ?

      There is G29 S1 that loads the heightmap from file, but You need to probe the bed first to get the right heightmap.csv file

      Also 4.1mm seems a little too high for bltouch. It usually is about 2.5 - 3 mm when installed correctly.
      If You need to babystep so much You should adjust Z trigger height according to
      https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_testing

      undefined 1 Reply Last reply 30 Dec 2023, 18:23 Reply Quote 0
      • undefined
        cbrunnem2 @BoA
        last edited by 30 Dec 2023, 18:23

        @BoA bed mesh was complete. see below. bed is not heated during this process and is very much room temp. the below mesh is after adjusting things so that the BLtouch triggers at 2.31mm. issue is still present. this time i had to jog to -1.7mm for the nozzle to just start grabbing a piece of paper. below is also my starting Gcode. i did have a z offset of .35mm in cura in my gcode as i was under the impression that was needed for cura but i have since removed it as it appears to make it worse.

        lastly, i agree that if i have to babystep so much i should adjust the z trigger... the issue is... as i typed this, i started another print and i had to babystep to -1.4mm to get a good first layer. it seem to change and drift over time.

        G91 ; Relative Positioning
        G1 Z-1 ; Move Z down 1mm
        G90 ; Absolute Positioning
        G28 XY ; Home XY
        M561 ; Clear any bed transform
        G1 X100 Y100 ; Move Probe to middle of bed
        G1 Z10 F6000 ; Move Z to 2
        G30 ; Do a single probe
        G29 S1 ; Load heightmap (you can use G29 S1 instead)
        G1 Z2 F6000 ; Move Z to 2
        M572 D0 S0.05 ;

        bed mesh.png

        undefined 1 Reply Last reply 30 Dec 2023, 21:44 Reply Quote 0
        • undefined
          BoA @cbrunnem2
          last edited by BoA 30 Dec 2023, 21:44

          @cbrunnem2 So You changed in config file

          G31 P500 X27.6 Y18.7 Z2.31
          

          as 2.31 was reported by G30 S-1 and You need to baby step even more?
          If You manually dial to position where Z=0 (nozzle should be just barely touching bed) is that actually the case?

          BTW - IMO Z should be homed and bed probed at printing temperature, as that might affect bed shape.
          What kind of printer You have?

          undefined 1 Reply Last reply 31 Dec 2023, 17:59 Reply Quote 0
          • undefined
            fcwilt @cbrunnem2
            last edited by 30 Dec 2023, 23:14

            @cbrunnem2

            You are aware that G30 S-1 only yields a correct result if the starting Z position is correct?

            Frederick

            Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

            undefined 1 Reply Last reply 31 Dec 2023, 18:00 Reply Quote 0
            • undefined
              OwenD
              last edited by 31 Dec 2023, 02:23

              @cbrunnem2
              As @fcwilt has alluded to, it sounds a bit like you're procedure may be a little off.

              If you are running RRF 3.5 try putting the two attached macros in you macros folder.
              Ideally create a folder > 0:/macros/bl_touch/
              Then run start_calibration.g

              It will step you through the calibration and carry out 10 cycles to determine the correct Z offset.
              The result is saved in config-override.g (or you can edit config.g if you wish)

              start_calibration.g
              calibrate_BLtouch.g

              undefined 1 Reply Last reply 31 Dec 2023, 17:57 Reply Quote 1
              • undefined
                cbrunnem2 @OwenD
                last edited by 31 Dec 2023, 17:57

                @OwenD im trying to run this. my firmware is messed up or something. i am installing.... hopefully 3.5rc1 right now using that blue button at the bottom of this picture.... that i didnt see before....

                hopefully this gets rid of the error when trying to run that macro saying i need to be on 3.5 or newer...

                471dbd72-5d27-4d4b-94cd-bb96ac20bad0-image.png

                Phaedruxundefined 1 Reply Last reply 31 Dec 2023, 18:27 Reply Quote 0
                • undefined
                  cbrunnem2 @BoA
                  last edited by 31 Dec 2023, 17:59

                  @BoA i dont run a heated bed as i havent needed to for PLA.

                  im in the middle of a firmware update BUT if i remember correctly, after getting the bed to grab a piece of paper, i would set that as z=0. if would grab a piece of paper if i moved and came back.

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    cbrunnem2 @fcwilt
                    last edited by 31 Dec 2023, 18:00

                    @fcwilt i am not sure what you mean exactly but i would only ever run G30 s-1 after homing x/y and after setting z=0 when the nozzle grabs a piece of paper.

                    undefined 1 Reply Last reply 31 Dec 2023, 19:10 Reply Quote 0
                    • Phaedruxundefined
                      Phaedrux Moderator @cbrunnem2
                      last edited by 31 Dec 2023, 18:27

                      @cbrunnem2 said in Changing Z offset with BLTouch:

                      my firmware is messed up or something

                      Try these files

                      https://github.com/Duet3D/RepRapFirmware/releases/download/3.5.0-rc.2/Duet2CombinedFirmware.bin

                      https://github.com/Duet3D/RepRapFirmware/releases/download/3.5.0-rc.2/DuetWebControl-SD.zip

                      Z-Bot CoreXY Build | Thingiverse Profile

                      undefined 1 Reply Last reply 31 Dec 2023, 19:14 Reply Quote 0
                      • undefined
                        fcwilt @cbrunnem2
                        last edited by 31 Dec 2023, 19:10

                        @cbrunnem2 said in Changing Z offset with BLTouch:

                        @fcwilt i am not sure what you mean exactly but i would only ever run G30 s-1 after homing x/y and after setting z=0 when the nozzle grabs a piece of paper.

                        Setting Z=0, using the method you mentioned, should insure that the Z position at the start of the G30 S-1 is reasonably correct and thus the value reported should be reasonably correct.

                        Frederick

                        Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                        undefined 1 Reply Last reply 31 Dec 2023, 19:19 Reply Quote 0
                        • undefined
                          cbrunnem2 @Phaedrux
                          last edited by 31 Dec 2023, 19:14

                          @Phaedrux Thank you. that did it. for whatever reason, whenever i uploaded the zip files, it would fail half way through

                          1 Reply Last reply Reply Quote 0
                          • undefined
                            cbrunnem2 @fcwilt
                            last edited by 31 Dec 2023, 19:19

                            @fcwilt thank you. i tried the macro above and it reported 2.5mm which is different than the 2.31 i got BUT what is interesting is that it said it would save it in my config.g but didnt... its properly in the config-override.g though.

                            even further, i still had to jog down the same amount basically as before. the issue is becoming more consistent. its basically me having to jog down to -1.25 to -1.3mm every time including this time. that is still a larger difference than between 2.31 and 2.5mm.

                            should i just add the 1.3mm to my 2.31mm and call it a day????

                            as i am writing this, i realized, some of my error is in not zeroing the bed at the correct nozzle temp but that is not 1.3mm of error. my math says its about .1mm of thermal expansion. i can fix that in the future calibrations.

                            undefined undefined undefined 3 Replies Last reply 31 Dec 2023, 19:33 Reply Quote 0
                            • undefined
                              BoA @cbrunnem2
                              last edited by 31 Dec 2023, 19:33

                              @cbrunnem2 Can You upload gcode that You are trying to print? Are You sure, there is no offset set in slicer or something?

                              When You set Z trigger height, home XYZ, and the jog to Z=0. Nozzle should be just touching printbed.
                              (Home XY, Home Z with probe, then jog to position where Z=0)

                              undefined 1 Reply Last reply 2 Jan 2024, 03:51 Reply Quote 0
                              • undefined
                                fcwilt @cbrunnem2
                                last edited by fcwilt 31 Dec 2023, 19:41

                                @cbrunnem2

                                You must always set the Z=0 Datum, using a single G30 as a fixed XY location, before creating the height map and before loading the height map to print.

                                And when determining the G31 Z Trigger Height, by whatever means, you need to use the same fixed XY location.

                                Some folks like to use a point of the height map grid. I use the center of the bed.

                                And you need to be sure baby-stepping and mesh compensation are disabled when doing either of the above.

                                Frederick

                                Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                                undefined 1 Reply Last reply 2 Jan 2024, 04:44 Reply Quote 0
                                • undefined
                                  engikeneer @cbrunnem2
                                  last edited by 31 Dec 2023, 20:37

                                  @cbrunnem2 to add to what @fcwilt had said, you should also reset your z=0 datum after performing bed levelling (and before loading/creating your heightmap).
                                  When it does the bed levelling, it can shift the datum depending on how level your bed is. Hence the need to rehome z with your z probe at the same xy position

                                  E3D TC with D3Mini and Toolboards.
                                  Home-built CoreXY, Duet Wifi, Chimera direct drive, 2x BMG, 300x300x300 build volume
                                  i3 clone with a bunch of mods

                                  1 Reply Last reply Reply Quote 1
                                  • undefined
                                    cbrunnem2 @BoA
                                    last edited by 2 Jan 2024, 03:51

                                    @BoA i appreciate your help and everyone elses. Thanks. Gcode below. Just the start.

                                    ;FLAVOR:RepRap
                                    ;TIME:2435
                                    ;Filament used: 3.38708m
                                    ;Layer height: 0.25
                                    ;MINX:48.526
                                    ;MINY:92.173
                                    ;MINZ:0.25
                                    ;MAXX:84.309
                                    ;MAXY:127.954
                                    ;MAXZ:25.5
                                    ;POSTPROCESSED
                                    ;Generated with Cura_SteamEngine 5.2.2
                                    T0
                                    M104 S230
                                    M109 S230
                                    M82 ;absolute extrusion mode
                                    G91 ; Relative Positioning
                                    G1 Z-1 ; Move Z down 1mm
                                    G90 ; Absolute Positioning
                                    G28 XY ; Home XY
                                    M561 ; Clear any bed transform
                                    G1 X100 Y100 ; Move Probe to middle of bed
                                    G1 Z10 F6000 ; Move Z to 2
                                    G30 ; Do a single probe
                                    G29 S1 ; Load heightmap (you can use G29 S1 instead)
                                    G1 Z2 F6000 ; Move Z to 2
                                    M572 D0 S0.05 ;
                                    M83 ;relative extrusion mode
                                    G1 F300 E-0.25
                                    ;LAYER_COUNT:102
                                    ;LAYER:0
                                    M107
                                    G1 F600 Z0.5
                                    G0 F2400 X57.32 Y94.657 Z0.5
                                    ;TYPE:SKIRT
                                    G1 F600 Z0.25
                                    G1 F300 E0.25
                                    G1 F600 X57.994 Y94.278 E0.03215
                                    G1 X58.844 Y93.849 E0.03958
                                    G1 X59.493 Y93.562 E0.0295
                                    G1 X60.145 Y93.305 E0.02914
                                    G1 X60.828 Y93.068 E0.03006
                                    G1 X61.356 Y92.904 E0.02299
                                    G1 X62.223 Y92.669 E0.03735
                                    G1 X63.006 Y92.501 E0.03329
                                    G1 X63.992 Y92.333 E0.04158
                                    G1 X64.7 Y92.253 E0.02962
                                    G1 X65.726 Y92.18 E0.04276
                                    G1 X66.568 Y92.173 E0.03501
                                    G1 X67.271 Y92.193 E0.02924
                                    G1 X68.306 Y92.269 E0.04315
                                    G1 X69.6 Y92.461 E0.05439
                                    G1 X70.377 Y92.617 E0.03295
                                    G1 X70.876 Y92.74 E0.02137
                                    G1 X71.429 Y92.892 E0.02384
                                    G1 X72.064 Y93.088 E0.02763
                                    G1 X73.012 Y93.422 E0.04179
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                                    G1 X74.453 Y94.08 E0.02148
                                    G1 X74.977 Y94.351 E0.02453
                                    G1 X75.581 Y94.691 E0.02882
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                                    G1 X55.542 Y95.855 E0.03139
                                    G1 X56.075 Y95.457 E0.02766
                                    G1 X56.545 Y95.137 E0.02364
                                    G1 X57.32 Y94.657 E0.0379
                                    G0 F2400 X57.516 Y95.006
                                    G1 F600 X58.305 Y94.562 E0.03764
                                    G1 X59.383 Y94.035 E0.04989
                                    G1 X60.292 Y93.677 E0.04062
                                    G1 X61.076 Y93.409 E0.03445
                                    G1 X61.605 Y93.248 E0.02299
                                    G1 X62.31 Y93.059 E0.03035
                                    G1 X62.827 Y92.943 E0.02203
                                    G1 X64.036 Y92.731 E0.05103
                                    G1 X64.978 Y92.63 E0.03939
                                    G1 X65.764 Y92.579 E0.03275
                                    G1 X66.787 Y92.576 E0.04253
                                    G1 X67.456 Y92.604 E0.02784
                                    G1 X68.258 Y92.666 E0.03344
                                    G1 X69.542 Y92.857 E0.05397
                                    G1 X70.359 Y93.016 E0.0346
                                    G1 X71.452 Y93.315 E0.04711
                                    G1 X71.931 Y93.466 E0.02088
                                    G1 X72.863 Y93.794 E0.04108
                                    G1 X73.674 Y94.151 E0.03684
                                    G1 X74.487 Y94.54 E0.03747
                                    G1 X75.37 Y95.03 E0.04198
                                    G1 X75.935 Y95.384 E0.02772
                                    G1 X76.37 Y95.674 E0.02174
                                    G1 X77.007 Y96.143 E0.03289
                                    G1 X77.722 Y96.712 E0.03799
                                    G1 X78.601 Y97.513 E0.04944
                                    G1 X79.113 Y98.031 E0.03028
                                    G1 X79.667 Y98.644 E0.03435
                                    G1 X80.21 Y99.308 E0.03566
                                    G1 X80.729 Y100.01 E0.0363
                                    G1 X81.279 Y100.839 E0.04136
                                    G1 X81.644 Y101.454 E0.02973
                                    G1 X81.991 Y102.103 E0.0306
                                    G1 X82.315 Y102.752 E0.03016
                                    G1 X82.636 Y103.512 E0.0343
                                    G1 X82.877 Y104.125 E0.02738
                                    G1 X83.155 Y104.98 E0.03738
                                    G1 X83.396 Y105.816 E0.03617
                                    G1 X83.618 Y106.901 E0.04604
                                    G1 X83.729 Y107.59 E0.02901
                                    G1 X83.845 Y108.515 E0.03876
                                    G1 X83.878 Y109.021 E0.02108
                                    G1 X83.908 Y110.024 E0.04172
                                    G1 X83.872 Y111.135 E0.04621
                                    G1 X83.777 Y112.184 E0.04379
                                    G1 X83.625 Y113.179 E0.04185
                                    G1 X83.482 Y113.898 E0.03048
                                    G1 X83.298 Y114.658 E0.03251
                                    G1 X83.139 Y115.203 E0.0236
                                    G1 X82.914 Y115.896 E0.03029
                                    G1 X82.611 Y116.671 E0.0346
                                    undefined 1 Reply Last reply 2 Jan 2024, 04:42 Reply Quote 0
                                    • undefined
                                      BoA @cbrunnem2
                                      last edited by BoA 1 Feb 2024, 04:44 2 Jan 2024, 04:42

                                      @cbrunnem2 Seems Your start g-code is a little messed up. Why not homing Z, but probing?
                                      Seems this one will not execute home.z or home_all nor bed.g at all (might be wrong, but looks that way for me).

                                      Probing and all other stuff is on purpose in printer files, so You can just execute G28 and G32.

                                      undefined 2 Replies Last reply 2 Jan 2024, 04:46 Reply Quote 0
                                      • undefined
                                        cbrunnem2 @fcwilt
                                        last edited by 2 Jan 2024, 04:44

                                        @fcwilt i just powered on my printer. when its off, the bed sags a bit so i immediately homed xyz. height map looks good. babystepping was always at 0

                                        i did the following commands:
                                        G1 x100y100
                                        g29 s2
                                        G1 z0 (stepped down till nozzle is on bed)
                                        G92 z0
                                        g30 s-1 put that number in config.g under the g31 line
                                        restarted board
                                        homed xyz
                                        G1 x100y100
                                        g29 s2
                                        G1 z0 (stepped down till nozzle is on bed)
                                        g92 z0
                                        g1 z10
                                        g1 z0 (nozzle is still on bed)
                                        G30 (it stops at 3.1mm which is what i have in g31)
                                        g1 z0 (nozzle is too high.... by -.85 which ironically, is the about what the math would say my previous number should be at -2.31)

                                        im at a lose here.... what am i doing wrong

                                        undefined 1 Reply Last reply 2 Jan 2024, 08:53 Reply Quote 0
                                        • undefined
                                          cbrunnem2 @BoA
                                          last edited by 2 Jan 2024, 04:46

                                          @BoA should i be doing a whole bed mesh at the start of every print? is that what you are saying?

                                          might be worth it if i can figure out this problem as a hole. check my last response. with the current issue, id be wasting so much time probing hte bed just to have to babystep or ruin a print.

                                          1 Reply Last reply Reply Quote 0
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