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    Consistent ripples on prints

    Duet Hardware and wiring
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    • Agniusm
      Agniusm last edited by

      So getting genuine duet maestro i can legitimately pursue my quest in finding an answer to my initial question.
      For those skeptical:
      0_1544722719562_duet.jpg
      Just made a square print on 2 machines, one with genuine duet, another on clone duet. Red is genuine, black - cloned.
      I can say that genuine duet introduced som other pattern that you can see on X axis but you can see that ripples are present on both boards so the issue is not with duet being genuine or not as i have speculated earlier.
      X axis:
      0_1544722918860_UpgVJWs.jpg
      Y axis:
      0_1544722945612_y.jpg
      Any insight @dc42 can provide?

      Phaedrux 1 Reply Last reply Reply Quote 1
      • Phaedrux
        Phaedrux Moderator @Agniusm last edited by

        @agniusm kinda looks like belt tooth pattern. Does it match the pitch of your belts?

        Z-Bot CoreXY Build | Thingiverse Profile

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

          @phaedrux It does not match and i have eliminated belts, pulleys, frame resonance from equation by swapping components, even motion system (Linear rail to stock POM wheels). Also acceleration and jerk are quiet low.

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

            What type of extruder do you have, what microstepping do you use on it, and what its its steps/mm?

            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

            Agniusm 1 Reply Last reply Reply Quote 0
            • Agniusm
              Agniusm @dc42 last edited by Agniusm

              @dc42 Titan extruder 16 microstepping, interpolation on, 412 steps, extruder tuned to extrude requested amount.
              I am waiting for different extruder to test, but when i think back, i had no ripples with malian or creality stock. I will look if i have a sample photo from long ago.

              P.S. These are printed with 32 microstepping on all axis red sample and 64 on black.

              1 Reply Last reply Reply Quote 0
              • Agniusm
                Agniusm last edited by Agniusm

                Few possibilities:
                Could it be low quality stock psu?
                0.9 motor has these almost gone but its tested with small pancake motor(e3d titan aero supplied) with speed reduced to 60%.
                Options what else could be causing this?

                Should mention that 2 systems(genuine and clone) are identical in hardware and software with same sliced file being used.

                1 Reply Last reply Reply Quote 0
                • 3dmntbighker
                  3dmntbighker last edited by

                  Regardless of the "emotional" aspects of this discussion I think it's probably very interesting to an Ender owner at the very least. And sounds like something useful will come out of all the work Agniusm is doing. Planning to invest in 12 printers, it's understandable someone might want to try to plan and budget without too many surprises at the end. If I were in that position it's quite possible I might buy clone boards until the revenue allowed me to replace them with genuine. Try to see it from his perspective. 😐 My CoreXY has a LOT more resonance than my Ender BTW. At least audible.

                  Scratch built CoreXY with Maestro
                  Heavily modified Ender 3 with Maestro
                  MPCNC work in progress with Duet WiFi

                  1 Reply Last reply Reply Quote 0
                  • Agniusm
                    Agniusm last edited by

                    Well said. Thank you for being openminded.

                    1 Reply Last reply Reply Quote 0
                    • Agniusm
                      Agniusm last edited by Agniusm

                      On genuine duet board there are C shaped artifacts that you might not see in photos clearly, 2 at the very right side are more visible (red sample) on x axis photo (still it might be caused by minuscule upobservable differences in machines) .
                      Somehow i lean towards motor incompatibility to duet. Blind guess but those motors are not made equal.

                      3dmntbighker 1 Reply Last reply Reply Quote 0
                      • 3dmntbighker
                        3dmntbighker @Agniusm last edited by

                        @agniusm said in Consistent ripples on prints:

                        On genuine duet board there are C shaped artifacts that you might not see in photos clearly, 2 at the very right side are more visible (red sample) on x axis photo (still it might be caused by minuscule upobservable differences in machines) .
                        Somehow i lean towards motor incompatibility to duet. Blind guess but those motors are not made equal.

                        Yeah, were I in your position I might order a similar stepper that is "supposed" to be a bit better quality and try it. It won't break the bank.

                        Scratch built CoreXY with Maestro
                        Heavily modified Ender 3 with Maestro
                        MPCNC work in progress with Duet WiFi

                        1 Reply Last reply Reply Quote 0
                        • Agniusm
                          Agniusm last edited by

                          I have ordered couole of these motors: https://www.omc-stepperonline.com/nema-17-stepper-motor/nema-17-bipolar-09deg-44ncm-623ozin-168a-28v-42x42x47mm-4-wires-17hm19-1684s.html?mfp=149-step-angle[0.9]
                          Are they OK? Just to remind, for 24V system

                          1 Reply Last reply Reply Quote 0
                          • Agniusm
                            Agniusm last edited by

                            I have been contacted by a member with the same issue on completly stock unit. I can strike out extruder now without even bothering testing it.
                            Motors shoukd be next week but i am off with kids to rehabilitation center so next weekend maybe.

                            hussainsail2002 1 Reply Last reply Reply Quote 0
                            • hussainsail2002
                              hussainsail2002 @Agniusm last edited by

                              @agniusm Hi,

                              Any update on this ?

                              Agniusm 1 Reply Last reply Reply Quote 0
                              • Agniusm
                                Agniusm @hussainsail2002 last edited by

                                @hussainsail2002 Yes, i have swapped for 0.9 degree stepper motors and the problem is gone to a minimum. The ripples do not feel physically anymore

                                hussainsail2002 nophead 2 Replies Last reply Reply Quote 0
                                • robm
                                  robm last edited by

                                  I think this is somehow a weakness of the cartesian / 'i3' design. I go back to fighting it now and then, but don't see it on my delta or the one print I've done on my new-to-me corexy.

                                  Agniusm 1 Reply Last reply Reply Quote 1
                                  • Agniusm
                                    Agniusm @robm last edited by

                                    @robm It must be. On other designs both x and y are more or less weight balanced and the print stays put.

                                    1 Reply Last reply Reply Quote 0
                                    • hussainsail2002
                                      hussainsail2002 @Agniusm last edited by

                                      @agniusm Thanks I had the rippling on my MKS board , when I changed to duet it got eliminated.

                                      Any Idea what the reason behind this could be ?

                                      1 Reply Last reply Reply Quote 0
                                      • nophead
                                        nophead @Agniusm last edited by

                                        @agniusm Did the spacing change (assuming you can still see a lesser effect)?

                                        Agniusm 1 Reply Last reply Reply Quote 0
                                        • Agniusm
                                          Agniusm @nophead last edited by

                                          @nophead Its very hard to see, basically impossible. i will see if i have old sample to get you photo comparison
                                          P.S. Black with 1.8 motor, clear with 0.9 motor if you can spot the difference
                                          alt text

                                          1 Reply Last reply Reply Quote 1
                                          • nophead
                                            nophead last edited by

                                            Black shiny plastic is always the worst for showing defects in my experience, so comparing it with clear is always going to be difficult and anything clear or white is hard to photograph with detail.

                                            Agniusm 1 Reply Last reply Reply Quote 0
                                            • Agniusm
                                              Agniusm @nophead last edited by

                                              @nophead yes bit the ripples were visible on clear too. Now they are gone.

                                              1 Reply Last reply Reply Quote 1
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