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    Help with multi color printing

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    • Surgikillundefined
      Surgikill @Phaedrux
      last edited by

      @phaedrux Notice the angled transition from white to red

      2021-04-20 21.25.57.jpg

      Same one with green to white.

      2021-04-20 21.25.57.jpg

      It should look like this where the layer is solid and you can't really see the transition.

      2021-04-20 21.26.37.jpg

      This happened on multiple of them. I'm thinking it might be my Z axis.

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        Perhaps the nozzle is not completely primed when it's going back to print. What order are your perimeters printed in? Inside out, or outside in?

        Z-Bot CoreXY Build | Thingiverse Profile

        Surgikillundefined 1 Reply Last reply Reply Quote 0
        • o_lampeundefined
          o_lampe @Surgikill
          last edited by

          @surgikill
          Your macros use M83 relative extrusion, but the main gcode file is sliced with M82 absolute extrusion. (compare line 1 and 9)
          I'd change everything to M83, just to be safe...

          dc42undefined 1 Reply Last reply Reply Quote 0
          • dc42undefined
            dc42 administrators @o_lampe
            last edited by dc42

            @o_lampe said in Help with multi color printing:

            @surgikill
            Your macros use M83 relative extrusion, but the main gcode file is sliced with M82 absolute extrusion. (compare line 1 and 9)
            I'd change everything to M83, just to be safe...

            RRF saves the relative/absolute extrusion status when running a macro and restores it afterwards; so this isn't strictly necessary. However, we recommend slicing with relative extrusion anyway.

            Are you sure that extruding 10mm of filament is sufficient after loading new filament? Can you see the new filament coming out of the nozzle when it is doing that?

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

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            • Surgikillundefined
              Surgikill @Phaedrux
              last edited by

              @phaedrux It is most definitely primed. I have 9 of these parts I print simultaneously and it happens on every single one exactly the same.

              @dc42 I extrude anywhere from 55-110mm of filament before the 10mm to purge and prime the nozzle, so yes, there is a ton of filament that comes out of the nozzle.

              o_lampeundefined 1 Reply Last reply Reply Quote 0
              • o_lampeundefined
                o_lampe @Surgikill
                last edited by

                @surgikill
                does your extruder setup require higher 'chamber pressure'? It seems logical to believe, a long purge will do. But you purge in free air and the oozing filament even pulls on the molten filament in the heater chamber.
                Chamber pressure begins to build up, when the nozzle is in print position above the part. Even 'pressure advance' can't help here.

                Surgikillundefined 1 Reply Last reply Reply Quote 0
                • Surgikillundefined
                  Surgikill @o_lampe
                  last edited by

                  @o_lampe It's a hemera. There should be plenty of print moves to "build up" chamber pressure before it moves onto the next layer. It would also show issues with retractions as well, which it does not, and it is even on all of the parts. I think it might be an issue with my Z axis not moving back into place correctly.

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                  • Phaedruxundefined
                    Phaedrux Moderator
                    last edited by

                    It does sound like a z height issue then, either mechanical or maybe thermal?

                    But you show that it doesn't happen every time, correct? So what is different between the times it happens and doesn't happen?

                    Z-Bot CoreXY Build | Thingiverse Profile

                    Surgikillundefined 1 Reply Last reply Reply Quote 0
                    • Surgikillundefined
                      Surgikill @Phaedrux
                      last edited by

                      @phaedrux No idea. I think it's mechanical. I'll look into my couplers and lead screws. I have no idea what happened to the one where it worked correctly. I'll change my pause and resume g-codes so it doesn't change Z height and we'll see what happens.

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

                        @surgikill are you physically/manually loading filament into the hemera for the filament change? Could it be that there is some flex/backlash in your carriage so that it sits a bit different after a tug to pull out the old filament (or a shove to push the new one in)?

                        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

                        Surgikillundefined 1 Reply Last reply Reply Quote 0
                        • Surgikillundefined
                          Surgikill @engikeneer
                          last edited by

                          @engikeneer Doubtful. 16mm rods on the y axis and 12mm rods on the x axis and it's really rigid, besides the fact that I just use the load/unload macro, so I don't really push on anything. I'm running a test print right now. My z couplers are kind of fucked up, so I'm guessing that's the issue.

                          o_lampeundefined 1 Reply Last reply Reply Quote 0
                          • o_lampeundefined
                            o_lampe @Surgikill
                            last edited by

                            @surgikill said in Help with multi color printing:

                            My z couplers are kind of fucked up, so I'm guessing that's the issue.

                            You are lifting the gantry with the Z-motors? On my first Prusa i3, i placed 4.5mm steel balls between stepper shaft and leadscrew.
                            That way I could eliminate compression of the couplers from the changing weight and inertia of the moving extruder.

                            Surgikillundefined 1 Reply Last reply Reply Quote 0
                            • Surgikillundefined
                              Surgikill @o_lampe
                              last edited by

                              @o_lampe It's a corexy. There are 4 Z motors. I need to get the spider couplers instead of the spring couplers.

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                              • Surgikillundefined
                                Surgikill
                                last edited by

                                Yeah, definitely my Z-axis. I ran some prints and changed my pause and resume to not lift Z and the indentation is gone. Looks like I need to get some pillow block bearings for the leadscrews and new couplers.

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