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    Prints are warping

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • TRATOONundefined
      TRATOON @TRATOON
      last edited by

      @Günter-Jibben @infiniteloop Actual Z0 for me is -1.35 from where it is now. I set it as Z=0 using G92 Z0, but it keeps going back to the original position, after probing and after restarting the printer.

      engikeneerundefined 1 Reply Last reply Reply Quote 0
      • engikeneerundefined
        engikeneer @TRATOON
        last edited by

        @tratoon if you are using a probe, you shouldn't be using G92.

        Set the z offset of your probe correctly in G31 in config.g. your z axis will be set to this value when the probe triggers

        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

        TRATOONundefined 3 Replies Last reply Reply Quote 0
        • TRATOONundefined
          TRATOON @engikeneer
          last edited by

          @engikeneer But to get a Z offset, don't I need to tell the printer where Z0 is and isn't G92 telling the printer where Z0 is?

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          • TRATOONundefined
            TRATOON @engikeneer
            last edited by

            @engikeneer So will my printer always set Z0 to where the probe is triggered, and I have to ell it (using the Z offset) where to put the nozzle in relation to the Z0, set by the probe?

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            • TRATOONundefined
              TRATOON @engikeneer
              last edited by

              @engikeneer And how do I stop a " the height map has a substantial Z offset. Suggest use Z-probe to establish Z=0 datum, then re-probe the mesh.
              30 points probed, min error -1.656, max error -1.329, mean -1.461, deviation 0.088
              Height map saved to file 0:/sys/heightmap.csv" warning?

              1 Reply Last reply Reply Quote 0
              • engikeneerundefined
                engikeneer @TRATOON
                last edited by

                @tratoon you can use G92 once when determining the z offset, but not after.

                My preferred approach is to set G31 Z0 (I.e. zero offset). Then probe the centre of the bed with a single G30. Then move z down until the nozzle just touches your bed. For a BLTouch, should be 1-2mm ish. Whatever that value is goes in G31 Z

                You can then tweak it a little bit if you find your first layer is too squished, or not squished enough

                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

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                • TRATOONundefined
                  TRATOON @engikeneer
                  last edited by

                  @engikeneer Thank you very much, that solved my problem

                  engikeneerundefined 1 Reply Last reply Reply Quote 1
                  • engikeneerundefined
                    engikeneer @TRATOON
                    last edited by

                    @tratoon re the warning message on the heightmap, you need to home z using your probe before creating your heightmap and before you load it. If you don't, it doesn't know where z=0 is (or thinks it's in the wrong place) so the heightmap ends up offset

                    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

                    TRATOONundefined 1 Reply Last reply Reply Quote 0
                    • TRATOONundefined
                      TRATOON @engikeneer
                      last edited by

                      @engikeneer I just needed to set the Z Offset, what you are saying doesn't make sense, as the printer won't probe unless all axis are homed.

                      engikeneerundefined 1 Reply Last reply Reply Quote 0
                      • engikeneerundefined
                        engikeneer @TRATOON
                        last edited by

                        @tratoon yes thats right.

                        However if you use a G92 Z0, or home Z with an endstop instead of the probe, it will allow you to run mesh, but you may get the error

                        Also, now you have created a mesh, you don't have to reprobe the whole bed every print, you can just load the existing heightmap that is now saved to the SD card with G29 S1. I have a 400 point mesh for my printer that takes over an hour to run, but is stable enough that I only have to redo it if I take the printer to pieces. I just have to make sure I home z with the BLTouch before I load the heightmap for each printer.

                        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

                        TRATOONundefined 1 Reply Last reply Reply Quote 0
                        • TRATOONundefined
                          TRATOON @engikeneer
                          last edited by TRATOON

                          @engikeneer , @infiniteloop, @Günter-Jibben I just started a print, and I used baby stepping to lower the nozzle during the first layer. However, when the second layer started printing, the nozzle was too low and was scraping the part, and that caused my filament sensor to pause the print as it was at 2% extrusion. Why is it that the nozzle had to be lower for the first layer but higher for all the layers after that. For the first layer, the babystep offset was -0.20, and for the layers after that, it had to be 0.04 is this normal, because I don't have this issue on my other 3D printers.

                          infiniteloopundefined 1 Reply Last reply Reply Quote 0
                          • infiniteloopundefined
                            infiniteloop @TRATOON
                            last edited by

                            @tratoon said in Prints are warping:

                            For the first layer, the babystep offset was -0.20, and for the layers after that, it had to be 0.04 is this normal?

                            Definitely not. Either the steps/mm for Z are wrong, or the nozzle pushed the bed down on the first layer. A third reason I can imagine are wrong settings in the slicer (1st layer height?).

                            TRATOONundefined 1 Reply Last reply Reply Quote 0
                            • TRATOONundefined
                              TRATOON @infiniteloop
                              last edited by

                              @infiniteloop first layer height is 0.3 rest are .25

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                              • TRATOONundefined
                                TRATOON @TRATOON
                                last edited by

                                Nozzle didn't push bed down as the nozzle was 2mm higher than the bed

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                                • TRATOONundefined
                                  TRATOON @TRATOON
                                  last edited by TRATOON

                                  And on the fifth layer or so, it completely stopped extruding. And I had to push filament into the extruder and then it would extrude. What is going on?

                                  alankilianundefined Norderundefined 2 Replies Last reply Reply Quote 0
                                  • alankilianundefined
                                    alankilian @TRATOON
                                    last edited by

                                    @tratoon Is it possible you have the wrong filament diameter set in your slicer?

                                    Or you have extrusion set to some amount other than 1.0?

                                    Can you post the STL and GCODE for your 20mm block again and I'll compare to my settings.

                                    SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                                    TRATOONundefined 3 Replies Last reply Reply Quote 0
                                    • TRATOONundefined
                                      TRATOON @alankilian
                                      last edited by

                                      @alankilian Which 20mm block?

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                                      • TRATOONundefined
                                        TRATOON @alankilian
                                        last edited by

                                        @alankilian Here is a XYZ calibration cubeCube.gcode

                                        20220711_XYZ_Calibration_Cube.stl

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                                        • TRATOONundefined
                                          TRATOON @alankilian
                                          last edited by

                                          @alankilian My filament diameter is correct. I looked up "extrusion" in Cura no relevant setting, so by that, I think you mean flow, which is set to 100%

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                                          • SpoonUnitundefined
                                            SpoonUnit
                                            last edited by

                                            Some thoughts...

                                            Would be interesting to see a print of only the first layer. If the nozzle height isn't right, and the first layer isn't spot on, that can lead to warping.

                                            I can't see at a glance from the thread whether you ever put the filament you're using in. The level of warpage makes me think it's ABS. Having the right bed heat and the right nozzle temp are crucial whatever the filament, but ABS I find to be quite picky on PEI. Also, the temp the bed reports is not always the actual bed surface temp. Personally I print ABS at 250C on a bed temp of 125 for the first layer and it prints pretty well as long as the geometry isn't fighting a good print.

                                            Sharp corners can lead to warping. While you're tuning, trying working with a cube with rounded edges instead of square edges. If you absolutely, positively, MUST print square corners, make your first layer super slow to try to avoid lifting.

                                            TRATOONundefined 1 Reply Last reply Reply Quote 0
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