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Problem setting the Z-Offset, BLTOUCH, RRF 3.1.1

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Tuning and tweaking
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  • undefined
    JoergS5 @omni
    last edited by JoergS5 6 Jul 2020, 15:51 7 Jun 2020, 15:35

    @omni If it is working for 3 days and then start making trouble again, one important possible reason would be an electrical contact which was corrected 3 days before (due to the testing/searching error) and after some printing and vibrations, the connection was lost again. You should check for cable breaks and defect crimping/cold soldering connections.

    Is there anything you changes while making G29, like bed heating?

    When you made the G29, please make a M122 also and show it.

    To discuss what could be wrong, I need to see some images from the printer: the print bed, the nozzle and BLTouch, and maybe the Z axis setup (stepper, coupling, spindle).

    undefined 1 Reply Last reply 7 Jun 2020, 16:31 Reply Quote 0
    • undefined
      omni @JoergS5
      last edited by omni 6 Jul 2020, 16:51 7 Jun 2020, 16:31

      @JoergS5 Thanks for your time man, I really appreciate it.

      Here is the image of the mesh :
      0d9a38a7-4a75-4d15-877f-654d3d3dac41-image.png

      Not much was changed, I added a laser filament monitor (but that shouldn't be a problem) and also added an additional 40mm fan to cool the extruder since the stepper motor is encapsulated in the carriage so I was afraid it may be overheating.

      As for the config.g the only I was mainly changing is the z-offset since I cannot seem to get the first layer at the correct height. One thing that is really bothering me is that G32 (true bed leveling) is doing adjustments each time I run it... even when the printer was not turned off.

      Another thing I have tried is the z-probe repeatability macro and the deviation from the mean last time was 0.005, so it is working. I also set the following line for thr Bltouch :

      M558 P9 C"^zprobe.in" H5 F300 T6000 A4 S.0.03

      Images of the printer:

      ARIES 04.jpg ARIES 03.jpg ARIES 02.jpg ARIES 01.jpgIMG_20200607_183908 (2).jpg

      undefined 1 Reply Last reply 7 Jun 2020, 17:28 Reply Quote 1
      • undefined
        omni
        last edited by 7 Jun 2020, 17:27

        UPDATE :

        It seems that something in my homing routine is screwing up the leveling mesh.

        When I do G32 and then G29 without homing - it very different :
        bb3ef0c7-5484-4cfe-a179-4bc2a7e9b0a2-image.png

        But when I do homing (G28) and then (G29) it goes all the way below the grind no matter what my z-offset for the probe is.

        Now on the new graph you can see that my Z0 is way too high since I was trying to compensate with the z-offset to see what will happen, but it seems that the G28 is screwing it up for some reason.....

        Do you maybe have the stock versions of homex.g homey.g homez.g and homeall.g so I can try to replace mine with the default ones?

        undefined 1 Reply Last reply 7 Jun 2020, 17:53 Reply Quote 0
        • undefined
          JoergS5 @omni
          last edited by JoergS5 6 Jul 2020, 17:49 7 Jun 2020, 17:28

          This post is deleted!
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          • undefined
            JoergS5 @omni
            last edited by JoergS5 6 Jul 2020, 17:59 7 Jun 2020, 17:53

            This post is deleted!
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            • undefined
              Phaedrux Moderator
              last edited by 7 Jun 2020, 21:34

              For tilt correction to work well you first need to ensure the bed itself is actually level in relation to the frame. To do this you might need to manaully adjust the gantry relative to the top bar and then level the bed to that. going forward the tilt correction should be good after a few passes so you might need to do G32 2 or 3 times to get it to converge.

              Also, for your homez, you should probe the center of the bed, not a corner.

              G1 X0 Y0 F6000 ; go to first probe point
              G30 ; home Z by probing the bed

              Also, slow your bltouch probing down a bit.

              Z-Bot CoreXY Build | Thingiverse Profile

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