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Twin Z axis Motors and MBLA

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Tuning and tweaking
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  • undefined
    Dizzwold
    last edited by Dizzwold 11 Oct 2022, 08:34 9 Nov 2022, 18:32

    Hi Guys,

    FIRMWARE_NAME: RepRapFirmware for Duet 3 MB6HC FIRMWARE_VERSION: 3.4.4 ELECTRONICS: Duet 3 MB6HC v1.01 FIRMWARE_DATE: 2022-10-20 16:19:01

    I'm commissioning my 6HC and I've previously been very kindly correct by @jay_s_uk regarding my incorrect use of M671.

    I'm converting my Tronxy X5sa Pro with the 6HC. It has 2 Z axis motors halfway in the Y axis and at either end of the X axis. I still have the original heatbed which is basically rolled aluminium with 6 adjusting screw. 4 on each corner and 2 halfway in the X axis front and back. For convenience, let's say I remove the 2 middle adjusters as they only warp things further, and I only have 1 adjuster in each corner.
    2o1GhdkDSLekc6SiV4VD4Q.jpg

    What I'd done previously, was I was using M671 to check the level in each corner where the 4 adjusting screws are( MBLA), and it would report how much I needed to adjust each corner from the first reference point. @jay_s_uk corrected me on this, as this should be used for where my 2 leadscrews are on my Z axis motors, which it now is.

    So although I'm still in the process of commissioning, I'm very green still and learning, doesn't this mean that i now have to manually level each corner with a piece of paper, or is there a way I could implement checking the level of the 4 corners of the bed using MBLA before I run a bed compensation.

    I've thought a little and starting looking at maybe a macro, but both the MBLA and bed levelling for independent Z axis motors both use M671, so is this even possible?
    If so, in what order should I run things, G32 - Macro (MBLA) - G29, or Macro (MBLA) - G32 - G29?
    I'm currently in the process of organising a independent triple Z axis with 8mm cast tool plate, and also looking for advice on magnets and adhesive for the magnets?

    Config.g

    ; Configuration file for Duet 3 MB 6HC (firmware version 3.3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.3.13 on Mon Sep 19 2022 16:04:20 GMT+0100 (British Summer Time)
    ; General preferences
    M575 P1 S1 B57600 ; enable support for PanelDue
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"Duet 3" ; set printer name
    M669 K1 ; select CoreXY mode
    ; Network
    M552 P
    ; Bed Leadscrew Positions
    M671 X5:278 Y146:146 P2.0 ; middle left, middle right
    G4 S1 ;wait for expansion boards to start
    ; Drives
    M569 P0.0 S0 ; physical drive 0.0 goes backwards
    M569 P0.1 S0 ; physical drive 0.1 goes backwards
    M569 P0.2 S1 ; physical drive 0.2 goes forwards
    M569 P0.3 S1
    M569 P121.0 S0 ; physical drive 0.3 goes forwards
    M584 X0.0 Y0.1 Z0.2:0.3 E121.0 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E333.40 ; 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 X900 Y900 Z900 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout
    ; Axis Limits
    M208 X-2 Y-8 Z0 S1 ; set axis minima
    M208 X330 Y330 Z400 S0 ; set axis maxima
    ; Endstops
    M574 X1 S1 P"!121.io1.in" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin !io1.in
    M574 Y1 S1 P"!io2.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin !io2.in
    ; Z-Probe
    M574 Z1 Z1 S2 ; set endstops controlled be probe
    M558 P8 C"^!121.io0.in" H5 F120 T6000 ; set Z probe type to switch and the dive height + speeds
    G31 P500 X-46 Y-19 Z2.45 ; set Z probe trigger value, offset and trigger height
    M557 X19:244 Y-2:304 P9 ; define mesh grid
    ; Heaters
    M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; 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 R0.187 K0.192:0.000 D1.89 E1.35 S1.00 B0 ; disable bang-bang mode for the bed 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"121.temp0" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
    M950 H1 C"121.out0" T1 ; create nozzle heater output on out1 and map it to sensor 1
    M307 H1 R2.498 K0.275:0.349 D6.79 E1.35 S1.00 B0 V24.0 ; disable bang-bang mode for heater and set PWM limit
    M143 H1 S280 ; set temperature limit for heater 1 to 280C
    ; Fans
    M950 F0 C"121.out1" Q500 ; create fan 0 on pin out4 and set its frequency
    M106 P0 C"Print Cooler" S0 H-1 ; set fan 0 name and value. Thermostatic control is turned off
    M950 F1 C"121.out2" Q500 ; create fan 1 on pin out5 and set its frequency
    M106 P1 C"Extruder Cooling" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on
    ; Tools
    M563 P0 S"Hemera" D0 H1 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
    ; Emergency Stop
    M950 J1 C"io4.in"
    M851 P1 T0 S0 R0
    ; Miscellaneous
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
    T0
    M501

    Bed.g

    ; bed.g
    ; called to perform automatic bed compensation via G32
    ;
    ; generated by RepRapFirmware Configuration Tool v3.3.13 on Mon Sep 19 2022 16:04:20 GMT+0100 (British Summer Time)
    ;M561 ; clear any bed transform
    ;G29 ; probe the bed and enable compensation
    G28 ; home
    G30 P0 X5 Y146 Z-9999 ; probe front left
    G30 P1 X278 Y146 Z-9999 S2 ; probe front right
    G1 X0 Y0
    undefined 1 Reply Last reply 9 Nov 2022, 20:24 Reply Quote 0
    • undefined
      Phaedrux Moderator
      last edited by 9 Nov 2022, 19:23

      Instead of leaving an adjuster in each corner, see if you can get away with leaving two corners on one side, and one in the middle on the opposite side to make a triangle for a 3 point adjustment. One of those corner points could actually be fixed, and then you only need to adjust the remaining two for tilt and roll. Of course this only makes sense of the bed itself is stiff enough to resist sagging or wild warping if left unsupported like that.

      With only 2 motors on either side the best you can do is tilt correction. I don't know what your budget is, or if the frame construction would lend itself to it, but I would either look into removing one motor entirely and use a belt linkage to turn the second side, or add a third motor for actual tilt and roll correction.

      @Dizzwold said in Twin Z axis Motors and MBLA:

      What I'd done previously, was I was using M671 to check the level in each corner where the 4 adjusting screws are( MBLA), and it would report how much I needed to adjust each corner from the first reference point. @jay_s_uk corrected me on this, as this should be used for where my 2 leadscrews are on my Z axis motors, which it now is.

      Technically you can use both. You can get the bed tilt corrected with the motors, and then you can use the method you were using to adjust the bed screws.

      Just send the M671 command to set the tilt points for the motors, probe the points and it will auto adjust the motors, and then another to set the points for the adjustment screws and probe those points and manually adjust.

      Then on top of that you could use a G29 mesh for the surface irregularities and correct for any remaining tilt/roll.

      You can do all of that within bed.g and call it with G32 if you like. Does that make sense?

      For reference:
      https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_auto_levelling

      https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_manual_levelling

      @Dizzwold said in Twin Z axis Motors and MBLA:

      I'm currently in the process of organising a independent triple Z axis with 8mm cast tool plate

      ah, perfect.

      Z-Bot CoreXY Build | Thingiverse Profile

      1 Reply Last reply Reply Quote 0
      • undefined
        jay_s_uk @Dizzwold
        last edited by 9 Nov 2022, 20:24

        @Dizzwold for a while I had an FLSun cube, which is a pretty similar setup to what you've got.
        I would use a combination of a manual levelling macro to adjust the 4 screws and G32 to initially get it level and then after that G32 was all that was needed.
        So I would first adjust the bed so it was set square to the bed frame, i.e. adjust all 4 screws to the same length, then run G32 to get the bed frame level and then the macro for the 4 screws (and adjust until they were all the same) and just run one then the other until it was flat.
        this is pretty much my manual levelling macro https://teamgloomy.github.io/useful_macros.html#manual-bed-levelling
        The M671 locations are the locations of the 4 screws holding the bed down.
        And this is the bed.g (G32) levelling macro I use https://teamgloomy.github.io/useful_macros.html#bedg-file-for-g32

        Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

        undefined 1 Reply Last reply 9 Nov 2022, 21:23 Reply Quote 0
        • undefined
          Dizzwold @jay_s_uk
          last edited by 9 Nov 2022, 21:23

          @jay_s_uk @Phaedrux

          Spoilt for choice. Thank you for your advice.

          @Phaedrux said in Twin Z axis Motors and MBLA:

          ah, perfect.

          Yeah, can't wait to extra complexity to something I've not yet mastered.
          I've already got the tool plate and a PEI sheet, just perusing my options regarding magnets or not. I don't like the idea of purchasing the tool plate, to then later think "I Wish I had it machined for magnets", after already applying the pei sheet.
          It will be along the lines of Ed Palisoc's triple z for the blv, that is when I get printing again.

          Thank you again.

          1 Reply Last reply Reply Quote 0
          • undefined
            Phaedrux Moderator
            last edited by 9 Nov 2022, 21:49

            Take a look at the printer in my signature. Rather than use 3 z motors for leveling, it uses a single z motor and 3 lead screws belted to it. The bed plate has 3 point leveling with adjustment screws. Once the screws are adjusted they don't really need a change unless there's been some percussive maintenance. So once manually leveled I run a mesh, and that's it.

            Once you have 3 motors, you have to keep them in sync, or re-sync them regularly. A single motor has no such need. Though syncing up the belted lead screws initially can be a bit tricky, since once the belt is on, they all want to move together.

            Z-Bot CoreXY Build | Thingiverse Profile

            undefined 1 Reply Last reply 10 Nov 2022, 10:04 Reply Quote 0
            • undefined
              Dizzwold @Phaedrux
              last edited by 10 Nov 2022, 10:04

              @Phaedrux @jay_s_uk

              @Phaedrux said in Twin Z axis Motors and MBLA:

              Take a look at the printer in my signature

              That's a good consideration, but for the future. I'm yet to print anything and I hadn't resolved the extruder heating/skipping step issue, so I'm yet to see if that was also linked to the fault I had on the previous board.
              I've not printed any of the parts for the 3 triple Z, bed carriers, linear rail attachments etc.

              I've not read to much on using macros yet, only really glanced at the info, so I'm going to leave that alone for time-being as I just want to get the thing running first.
              Sorry @jay_s_uk and thank you for you advice and link to your examples. I will look into this in greater depth once I'm up and running.

              For the moment, I think I can better grasp @Phaedrux idea of running the 2 together in Bed.g. I've just had a pop at this, but not got it quite correct.
              I get the following error;
              Screen Shot 2022-11-10 at 09.38.18.png
              Bed.g

              ; bed.g
              ; called to perform automatic bed compensation via G32
              ;
              ; generated by RepRapFirmware Configuration Tool v3.3.13 on Mon Sep 19 2022 16:04:20 GMT+0100 (British Summer Time)
              ;M561 ; clear any bed transform
              ;G29 ; probe the bed and enable compensation
              G28 ; home
              G30 P0 X5 Y146 Z-9999 ; probe front left
              G30 P1 X278 Y146 Z-9999 S2 ; probe front right
              ;G1 X0 Y0 F12000
              G28
              G30 P0 X5 Y5 Z-9999 ; probe front left
              G30 P1 X278 Y5 Z-9999 ; probe front right
              G30 P2 X278 Y302 Z-9999 ; probe rear right
              G30 P3 X5 Y302 Z-9999 S4 ;probe rear left
              G1 X0 Y0 F12000

              I've messed an tweaked around with this. Changed the 2nd set of G30 commands to P2 ,P3 ,P4 & P5, but similar results. Cut-out the middle G1 and add the middle G28.
              Should I add another line M671 in config.g for the 2nd set, the adjuster screws under the leadscrew positions?

              Config.g

              ; Configuration file for Duet 3 MB 6HC (firmware version 3.3)
              ; executed by the firmware on start-up
              ;
              ; generated by RepRapFirmware Configuration Tool v3.3.13 on Mon Sep 19 2022 16:04:20 GMT+0100 (British Summer Time)
              ; General preferences
              M575 P1 S1 B57600 ; enable support for PanelDue
              G90 ; send absolute coordinates...
              M83 ; ...but relative extruder moves
              M550 P"Duet 3" ; set printer name
              M669 K1 ; select CoreXY mode
              ; Network
              M552 Pxxx.xxx.xxx.xxx
              ; Bed Leadscrew Positions
              M671 X5:278 Y146:146 P2.0 X5:278:278:5 Y5:5:302:302 P0.5 ; middle left, middle right
              G4 S1 ;wait for expansion boards to start
              ; Drives
              M569 P0.0 S0 ; physical drive 0.0 goes backwards
              M569 P0.1 S0 ; physical drive 0.1 goes backwards
              M569 P0.2 S1 ; physical drive 0.2 goes forwards
              M569 P0.3 S1
              M569 P121.0 S0 ; physical drive 0.3 goes forwards
              M584 X0.0 Y0.1 Z0.2:0.3 E121.0 ; set drive mapping
              M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
              M92 X80.00 Y80.00 Z400.00 E333.40 ; 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 X900 Y900 Z900 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
              M84 S30 ; Set idle timeout
              ; Axis Limits
              M208 X-2 Y-8 Z0 S1 ; set axis minima
              M208 X330 Y330 Z400 S0 ; set axis maxima
              ; Endstops
              M574 X1 S1 P"!121.io1.in" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin !io1.in
              M574 Y1 S1 P"!io2.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin !io2.in
              ; Z-Probe
              M574 Z1 Z1 S2 ; set endstops controlled be probe
              M558 P8 C"^!121.io0.in" H5 F120 T6000 ; set Z probe type to switch and the dive height + speeds
              G31 P500 X-46 Y-19 Z2.45 ; set Z probe trigger value, offset and trigger height
              M557 X19:244 Y-2:304 P9 ; define mesh grid
              ; Heaters
              M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; 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 R0.187 K0.192:0.000 D1.89 E1.35 S1.00 B0 ; disable bang-bang mode for the bed 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"121.temp0" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
              M950 H1 C"121.out0" T1 ; create nozzle heater output on out1 and map it to sensor 1
              M307 H1 R2.498 K0.275:0.349 D6.79 E1.35 S1.00 B0 V24.0 ; disable bang-bang mode for heater and set PWM limit
              M143 H1 S280 ; set temperature limit for heater 1 to 280C
              ; Fans
              M950 F0 C"121.out1" Q500 ; create fan 0 on pin out4 and set its frequency
              M106 P0 C"Print Cooler" S0 H-1 ; set fan 0 name and value. Thermostatic control is turned off
              M950 F1 C"121.out2" Q500 ; create fan 1 on pin out5 and set its frequency
              M106 P1 C"Extruder Cooling" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on
              ; Tools
              M563 P0 S"Hemera" D0 H1 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
              ; Emergency Stop
              M950 J1 C"io4.in"
              M851 P1 T0 S0 R0
              ; Miscellaneous
              M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
              T0
              M501

              How can I resolve this. If I remove the S2 and changed the S4 to S6, then surely it won't report and adjust the leadscrews?

              I also had a warning response after doing a bed pid, but I'd cleared the console before taking a screenshot. I've had a look to see if I can find somekind of log to recover this warning but I don't see anything to do so?
              Looks Like I'll have to pid the bed again, when I've took the dog out.

              undefined 1 Reply Last reply 10 Nov 2022, 14:46 Reply Quote 0
              • undefined
                Dizzwold @Dizzwold
                last edited by 10 Nov 2022, 14:46

                @jay_s_uk @Phaedrux

                Hi Guys,

                I had just written a reply stating that I still hadn't quite figured it out, but I think I've kind-of grasp both your ideas, although they need tidying up they both work;
                Screen Shot 2022-11-10 at 14.05.08.png

                Bed.g

                ; bed.g
                ; called to perform automatic bed compensation via G32
                ;
                ; generated by RepRapFirmware Configuration Tool v3.3.13 on Mon Sep 19 2022 16:04:20 GMT+0100 (British Summer Time)
                ;M561 ; clear any bed transform
                ;G29 ; probe the bed and enable compensation
                M671 X5:278 Y146:146 P2.0
                G28 ; home
                G30 P0 X5 Y146 Z-9999 ; probe front left
                G30 P1 X278 Y146 Z-9999 S2 ; probe front right
                G1 X0 Y0 F12000
                ;G28
                M671 X5:278:278:5 Y5:5:302:302 P0.5
                G28
                G30 P0 X5 Y5 Z-9999 ; probe front left
                G30 P1 X278 Y5 Z-9999 ; probe front right
                G30 P2 X278 Y302 Z-9999 ; probe rear right
                G30 P3 X5 Y302 Z-9999 S4 ;probe rear left
                G1 X0 Y0 F12000

                Config.g

                ; Configuration file for Duet 3 MB 6HC (firmware version 3.3)
                ; executed by the firmware on start-up
                ;
                ; generated by RepRapFirmware Configuration Tool v3.3.13 on Mon Sep 19 2022 16:04:20 GMT+0100 (British Summer Time)
                ; General preferences
                M575 P1 S1 B57600 ; enable support for PanelDue
                G90 ; send absolute coordinates...
                M83 ; ...but relative extruder moves
                M550 P"Duet 3" ; set printer name
                M669 K1 ; select CoreXY mode
                ; Network
                M552 Pxxx.xxx.xxx.xxx
                ; Bed Leadscrew Positions
                M671 X5:278 Y146:146 P2.0 ; middle left, middle right
                M671 X5:278:278:5 Y5:5:302:302 P0.5
                G4 S1 ;wait for expansion boards to start
                ; Drives
                M569 P0.0 S0 ; physical drive 0.0 goes backwards
                M569 P0.1 S0 ; physical drive 0.1 goes backwards
                M569 P0.2 S1 ; physical drive 0.2 goes forwards
                M569 P0.3 S1
                M569 P121.0 S0 ; physical drive 0.3 goes forwards
                M584 X0.0 Y0.1 Z0.2:0.3 E121.0 ; set drive mapping
                M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
                M92 X80.00 Y80.00 Z400.00 E333.40 ; 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 X900 Y900 Z900 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
                M84 S30 ; Set idle timeout
                ; Axis Limits
                M208 X-2 Y-8 Z0 S1 ; set axis minima
                M208 X330 Y330 Z400 S0 ; set axis maxima
                ; Endstops
                M574 X1 S1 P"!121.io1.in" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin !io1.in
                M574 Y1 S1 P"!io2.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin !io2.in
                ; Z-Probe
                M574 Z1 Z1 S2 ; set endstops controlled be probe
                M558 P8 C"^!121.io0.in" H5 F120 T6000 ; set Z probe type to switch and the dive height + speeds
                G31 P500 X-46 Y-19 Z2.45 ; set Z probe trigger value, offset and trigger height
                M557 X19:244 Y-2:304 P9 ; define mesh grid
                ; Heaters
                M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; 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 R0.187 K0.192:0.000 D1.89 E1.35 S1.00 B0 ; disable bang-bang mode for the bed 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"121.temp0" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
                M950 H1 C"121.out0" T1 ; create nozzle heater output on out1 and map it to sensor 1
                M307 H1 R2.498 K0.275:0.349 D6.79 E1.35 S1.00 B0 V24.0 ; disable bang-bang mode for heater and set PWM limit
                M143 H1 S280 ; set temperature limit for heater 1 to 280C
                ; Fans
                M950 F0 C"121.out1" Q500 ; create fan 0 on pin out4 and set its frequency
                M106 P0 C"Print Cooler" S0 H-1 ; set fan 0 name and value. Thermostatic control is turned off
                M950 F1 C"121.out2" Q500 ; create fan 1 on pin out5 and set its frequency
                M106 P1 C"Extruder Cooling" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on
                ; Tools
                M563 P0 S"Hemera" D0 H1 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
                ; Emergency Stop
                M950 J1 C"io4.in"
                M851 P1 T0 S0 R0
                ; Miscellaneous
                M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
                T0
                M501

                *Nb, I've omited M98 P"Bed_Adjusting_Screws.g" from bed.g.
                Screen Shot 2022-11-10 at 14.35.54.png
                Bed Adjusting Screw Macro

                G28
                M671 X5:278:278:5 Y5:5:302:302 P0.5
                G30 P0 X5 Y5 Z-9999 ; probe front left
                G30 P1 X278 Y5 Z-9999 ; probe front right
                G30 P2 X278 Y302 Z-9999 ; probe rear right
                G30 P3 X5 Y302 Z-9999 S4 ;probe rear left
                G1 X0 Y0 F12000

                So it looks like I've learnt more than I even expected today.

                Now I'll try the bed pid again...

                Thank you both again for your help, I'm really grateful. You have the patience of saint's.

                1 Reply Last reply Reply Quote 1
                • undefined
                  Phaedrux Moderator
                  last edited by 10 Nov 2022, 19:48

                  Yes I think you've got it.

                  Z-Bot CoreXY Build | Thingiverse Profile

                  undefined 1 Reply Last reply 11 Nov 2022, 08:17 Reply Quote 0
                  • undefined
                    Dizzwold @Phaedrux
                    last edited by 11 Nov 2022, 08:17

                    @Phaedrux @jay_s_uk

                    Hm, Maybe I don't or there is something else a-miss. In the 1st image everything looks fine, but in the 2nd image everything gone pear shaped;
                    Screen Shot 2022-11-11 at 08.12.54.png
                    Screen Shot 2022-11-11 at 08.12.00.png

                    undefined undefined 2 Replies Last reply 11 Nov 2022, 08:20 Reply Quote 0
                    • undefined Dizzwold referenced this topic 11 Nov 2022, 08:19
                    • undefined
                      jay_s_uk @Dizzwold
                      last edited by 11 Nov 2022, 08:20

                      @Dizzwold can you run G32 again before you run G29?
                      that is a decent dip in the bed though.
                      If you put a straight edge on the bed along the X axis can you see anything like the 1mm dip its showing?
                      What type of probe are you using?

                      Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                      undefined 1 Reply Last reply 11 Nov 2022, 09:46 Reply Quote 0
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                        Dizzwold @jay_s_uk
                        last edited by 11 Nov 2022, 09:46

                        @jay_s_uk

                        I'm waiting for the bed to cool down and do another PID tune.

                        The bed is the original Tronxy 300 x330 (rolled Alloy) with the Tronxy TR Glass Sensor (Z probe), Inductive NPN with the Glass Bed that comes with the Probe;
                        https://www.tronxy3d.com/products/tronxy-black-tr-auto-leveling-sensor-lattice-glass-plate-500-500mm
                        It's usually quite reliable IMO, and even with the faulty board previously, it was never this off.

                        undefined 1 Reply Last reply 11 Nov 2022, 09:47 Reply Quote 0
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                          Dizzwold @Dizzwold
                          last edited by 11 Nov 2022, 09:47

                          @jay_s_uk

                          Is there a way to run a log while running the bed pid, G32, G29?

                          undefined 1 Reply Last reply 11 Nov 2022, 10:14 Reply Quote 0
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                            Dizzwold @Dizzwold
                            last edited by 11 Nov 2022, 10:14

                            @jay_s_uk
                            Okay, I've just done, with a Cold bed and nozzle M561, G32, G29, and got the following results. I've left the machine powered on over night thinking that the motors (Z axis) would hold position, but with the result it would look like this isn't the case. So I reset the Z=0 (G92 Z0, G30 S-1), and try again;
                            Screen Shot 2022-11-11 at 10.07.47.png

                            Yet, I now have this for the height map???

                            Screen Shot 2022-11-11 at 10.12.47.png

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                              gloomyandy @Dizzwold
                              last edited by 11 Nov 2022, 10:22

                              @Dizzwold It's a bit hard to see if that step is in the X or Y axis. If it is in the Y axis so the first half of the entire probe is one level and the second half is another, then that may be due to lost steps in Z movement. If the step is in X, so that it happens as the head scans left/right then I'd be checking that nothing is "pulling on the print head" like a bowden tube or wiring and causing movement.

                              undefined 1 Reply Last reply 11 Nov 2022, 10:40 Reply Quote 0
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                                Dizzwold @gloomyandy
                                last edited by 11 Nov 2022, 10:40

                                @gloomyandy

                                Hi,

                                Oh dogs balls, that could be my hotend cable chain, rather the nylon cable braid around it.
                                The idea of the cable braiding was to stop the cable chain inverting inwards and blocking the path of the carriage.
                                unp3vU%kSze5OXMyQhZpUQ.jpg s2lbgc8zTwiZptakjMp8GQ.jpg

                                undefined 1 Reply Last reply 11 Nov 2022, 15:06 Reply Quote 0
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                                  Dizzwold @Dizzwold
                                  last edited by 11 Nov 2022, 15:06

                                  @jay_s_uk @gloomyandy @Phaedrux

                                  I've done another Bed PID, and got a similar warning message.

                                  The graph raised and fell between 69.9 and 75.1;
                                  Screen Shot 2022-11-11 at 14.08.39.png
                                  Screen Shot 2022-11-11 at 14.28.52.png
                                  Screen Shot 2022-11-11 at 14.46.25.png
                                  Screen Shot 2022-11-11 at 14.59.58.png
                                  Screen Shot 2022-11-11 at 15.02.17.png

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                                    Phaedrux Moderator
                                    last edited by 11 Nov 2022, 20:09

                                    If you save those values and use them are you able to set a temp for the bed and have it reach it and maintain it?

                                    Z-Bot CoreXY Build | Thingiverse Profile

                                    undefined 1 Reply Last reply 12 Nov 2022, 11:12 Reply Quote 0
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                                      Dizzwold @Phaedrux
                                      last edited by 12 Nov 2022, 11:12

                                      @Phaedrux

                                      For the bed, just about. I don't think it will go much higher than that, bearing in mind this is the stock Tronxy heater and bed.

                                      Cant wait to get the parts printed for the cast tool plate.

                                      I was having a problem that now I'm printing, that I was having to add around 0.5mm in babysteps.
                                      I've figured out why this was.
                                      I was setting Z Probe height with G31 in config.g with the Tool position /nozzle height shown, hence to 0.5mm.

                                      undefined 1 Reply Last reply 12 Nov 2022, 17:05 Reply Quote 0
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                                        Phaedrux Moderator @Dizzwold
                                        last edited by 12 Nov 2022, 17:05

                                        @Dizzwold said in Twin Z axis Motors and MBLA:

                                        Tronxy heater and bed.

                                        Well 70c for that bed heater is probably the limit.

                                        Z-Bot CoreXY Build | Thingiverse Profile

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