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    ovals instead of circles

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    • Leblondundefined
      Leblond
      last edited by

      Good evening everyone, I'm here to submit a printing problem. I would like to know if it has happened to any of you that when you print vertically, these circles, when finished printing, turn out to be oval.
      Board: Duet 2 WiFi (2WiFi)
      Firmware: RepRapFirmware for Duet 2 WiFi / Ethernet 3.2 (2021-01-05)
      Duet WiFi Server Version: 1.25
      Slicer - Simplify3d and Cura 4.8

      Stephen6309undefined 1 Reply Last reply Reply Quote 0
      • MikeSundefined
        MikeS
        last edited by MikeS

        That's normal because we print "sliced" stl. The circle resolution is limited on Z axis to your layer height so it will be always print as an oval instead of a circle. That should not happed if printed on the XY plane. On that plane usally you'll get smaller circle than the design caused by stl resoultion (triangle counts) and also for plastic being overextruded on the inside of a circular movement.
        alt text

        Here's a trick to compensate for this problem at design: https://re3d.zendesk.com/hc/en-us/community/posts/360057694271-Printing-the-Most-Circular-Circle-along-the-Z-axis

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        • Leblondundefined
          Leblond
          last edited by

          thanks for the answer, but it seems a bit strange to me since I have always printed and I do not say that the circles were perfect but not oval for sure, I will investigate more thoroughly

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          • Phaedruxundefined
            Phaedrux Moderator
            last edited by

            How oval are you seeing? Photo of the previewed STL and the resulting print?

            Z-Bot CoreXY Build | Thingiverse Profile

            Leblondundefined 1 Reply Last reply Reply Quote 0
            • Leblondundefined
              Leblond
              last edited by

              OK I'll post it all tomorrow afternoon

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              • Leblondundefined
                Leblond @Phaedrux
                last edited by

                @Phaedrux Good afternoon, here are the files you requested!

                IMG_20210107_133002.jpg

                Aggancio telaio v3.stl

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                • Leblondundefined
                  Leblond
                  last edited by

                  The piece I did it with fusion 360

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                  • Stephen6309undefined
                    Stephen6309 @Leblond
                    last edited by

                    @Leblond Make holes something like this:
                    Untitled.png

                    The flat at the top helps to prevent the filament from falling into the hole.

                    The openscad code for this example:
                    hull() {
                    cylinder(h=5,d=20);
                    translate([12,-4,0]) cube([1,8,5]);
                    }

                    Leblondundefined 1 Reply Last reply Reply Quote 0
                    • Leblondundefined
                      Leblond @Stephen6309
                      last edited by

                      @Stephen6309

                      The plate on top helps prevent filament from falling into the hole. I knew this, as far as I know with care there are tricks to avoid the plate, maybe I have the wrong settings I just have to understand where I was wrong, but to make you understand better I designed this to make you understand ..

                      Immagine.jpg

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                      • Leblondundefined
                        Leblond
                        last edited by

                        and it never happened to me, at least until recently

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                        • Phaedruxundefined
                          Phaedrux Moderator
                          last edited by

                          It looks like you've got some bad ringing and maybe too hot temps? Too high jerk?

                          Z-Bot CoreXY Build | Thingiverse Profile

                          Leblondundefined 1 Reply Last reply Reply Quote 0
                          • Leblondundefined
                            Leblond @Phaedrux
                            last edited by

                            @Phaedrux

                            probable, in fact I put my hand back to the configuration and I lowered the jerk from 1000 to 600, then once another piece is printed if I get improvements I post a photo

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                            • Leblondundefined
                              Leblond
                              last edited by

                              even the temperatures will have to lower by 5 degrees, petg mold at 230 degrees the print bed 75 degrees

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