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    Prusa upgraded to duet, weird extrusion

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    Tuning and tweaking
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    • Vetiundefined
      Veti
      last edited by

      @Murloc992 said in Prusa upgraded to duet, weird extrusion:

      Did you swap just X and Y steppers or all of them?

      i only swapped x and y
      https://e3d-online.com/high-torque-motor
      (be aware i only found out they have no cut shaft, but they work nonetheless.)

      Murloc992undefined 1 Reply Last reply Reply Quote 0
      • Murloc992undefined
        Murloc992 @Veti
        last edited by

        @Veti said in Prusa upgraded to duet, weird extrusion:

        (be aware i only found out they have no cut shaft, but they work nonetheless.)

        You mean no flat spot?

        "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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        • Vetiundefined
          Veti
          last edited by

          yes. i mainly got them because those were the only ones with swappable cable.

          a good alternative are the steppers suggested here
          https://www.thingiverse.com/thing:3382718

          Murloc992undefined 1 Reply Last reply Reply Quote 1
          • Murloc992undefined
            Murloc992 @Veti
            last edited by

            @Veti

            Maybe you have pics of print results with E3D motors? I have some motors with same specs to buy locally, but E3D are.. cheaper?

            "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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            • Vetiundefined
              Veti
              last edited by

              those where posted here
              https://forum.duet3d.com/topic/9438/artefacts-on-walls

              Murloc992undefined 1 Reply Last reply Reply Quote 1
              • Murloc992undefined
                Murloc992 @Veti
                last edited by Murloc992

                @Veti

                Thank you. Now I just need to wait till my steppers arrive and update this post. 🙂 Going to change X/Y and E.

                "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                • Murloc992undefined
                  Murloc992
                  last edited by Murloc992

                  So I've upgraded my motors to E3D ones:

                  X/Y: https://e3d-online.com/high-torque-motor
                  E: https://e3d-online.com/compact-but-powerful-motor

                  Now I have a WEIRD pattern that comes from the extruder motor:
                  2019-12-18 00.51.44.jpg
                  2019-12-18 00.51.46.jpg
                  (I know, my first layer is too high, I just wanted to test ASAP)

                  I can hear the extruder motor making such "patterned noise"..

                  I have started at 1000mA current(both driver and motor cool), then tried to make it 1400mA(driver a bit hotter than lukewarm, motor cool/warm) with no change in behavior. What is this artifact?

                  "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                  • Vetiundefined
                    Veti
                    last edited by

                    @Murloc992 said in Prusa upgraded to duet, weird extrusion:

                    Now I have a WEIRD pattern that comes from the extruder motor:

                    are you sure its from the extruder? how does it look if you switch back to the old motor on the extruder?

                    Murloc992undefined 1 Reply Last reply Reply Quote 0
                    • Murloc992undefined
                      Murloc992 @Veti
                      last edited by Murloc992

                      @Veti

                      I am sure, it's making pulsing noise even when spinning alone, without any plastic or idler engaged.. The old one doesn't pulse.. I have tried increasing microsctepping and disabling interpolation (nothing), reducing current(nothing), increasing current to maximum(heat increased only)..

                      This is the best I got:
                      2019-12-18 09.24.51.jpg
                      2019-12-18 09.24.58.jpg

                      The pattern is uniform on all sides.

                      Last time I had it was when I had too thin wires for my motor on an old printer and wires were heating up. But these are E3D cables, I haven't even changed the pins, tried different cables too and they are not heating up at all even at maximum current..

                      The one I had on my old printer was extreme.. and fixed after changing the extruder cabling.
                      2019-02-26 22.15.54.jpg

                      "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                      • Murloc992undefined
                        Murloc992
                        last edited by

                        Maybe this could be related to low voltage? I use 12V. Also I got an advice to attempt to reduce microstepping of the extruder motor to 8 microsteps. I will lose the interpolation though.. Will this matter?

                        Need an expert here. 🙂

                        "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                        • droftartsundefined
                          droftarts administrators
                          last edited by droftarts

                          I'd say that somewhere in your extruder drive, a gear is running eccentrically, or there's some other mechanical factor that's causing the the filament to speed up and slow down as it passes through the extruder. Is the stepper motor geared to the hobbed drive, or directly connected? I'd look if the gear on the motor shaft is running eccentrically, due to the hole being off centre, particularly if it's a geared extruder drive, as this would give the short frequency of over/under extrusion you're seeing. If you're using Chinese cloned gears (I think the Bear uses Bondtech BMG parts), this is quite likely!

                          Edit: Could also be caused by using very coarse hobbed drive.

                          Ian

                          Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                          Murloc992undefined 1 Reply Last reply Reply Quote 1
                          • Murloc992undefined
                            Murloc992 @droftarts
                            last edited by Murloc992

                            @droftarts

                            This might be a possibility. I use a genuine Prusa MK2.5S that was torn apart and resurrected into a Full Bear + Bear Extruder + Duet + New motors(now).

                            The gears are genuine Bondtech, extruder is as direct as it gets (Bear Extruder), but I wonder how can it be eccentric.. With old motor I didn't have this.. Maybe a difference in flatspots? Or could it have happened if I tightened onto the flatspot a bit angled? Maybe a bent motor shaft (I hope not..)?

                            "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

                            droftartsundefined 1 Reply Last reply Reply Quote 0
                            • droftartsundefined
                              droftarts administrators @Murloc992
                              last edited by

                              @Murloc992 Quite possibly one of those! As it's so consistent, I'd think it has to be mechanical. If you can't spot anything obvious, maybe refit the old motor and revert extruder settings in config.g?

                              Ian

                              Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                              Murloc992undefined 1 Reply Last reply Reply Quote 0
                              • Murloc992undefined
                                Murloc992 @droftarts
                                last edited by

                                @droftarts

                                Every time I have to take the extruder of a prusa apart(including the wiring loom) I die a little inside, but I guess I will have to if I can't center the main gear.. 😞

                                Will need to upgrade the extruder wiring loom someday to use a PCB at the back, so the wiring loom will be independent..

                                "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                                • Phaedruxundefined
                                  Phaedrux Moderator
                                  last edited by

                                  The fact that you can hear it pulsing makes me think it's the motor itself. Does it still sound like that if you run it free of any connection to the extruder gearing?

                                  Z-Bot CoreXY Build | Thingiverse Profile

                                  Murloc992undefined 1 Reply Last reply Reply Quote 0
                                  • Murloc992undefined
                                    Murloc992
                                    last edited by

                                    The motor shaft is straight, the gear is straight. Motor switch didn't help. All of them pulse. I will try reducing my microsteps to 8.. Maybe somebody knows about a TMC parameter called "Velocity"? I remember there's some register adjustments but I can't find it at the moment..

                                    "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                                    • Murloc992undefined
                                      Murloc992 @Phaedrux
                                      last edited by Murloc992

                                      @Phaedrux It does, in fact, all the 0.9 degree motors I bought sound like that. Even without load.. I suspect that I need to adjust something in the drivers themselves. I used 1.8 degree steppers, now I got 0.9 degree ones.

                                      "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                                      • Phaedruxundefined
                                        Phaedrux Moderator
                                        last edited by

                                        What is the power supply?

                                        Z-Bot CoreXY Build | Thingiverse Profile

                                        Murloc992undefined 1 Reply Last reply Reply Quote 0
                                        • Murloc992undefined
                                          Murloc992 @Phaedrux
                                          last edited by

                                          @Phaedrux Whatever came with Prusa MK2S originally.. 12V and I guess 20A? Maybe 15A, not sure.

                                          "Prusa Bear" : Full Bear frame, Bear X-Axis and Extruder. Duet 2 WiFi with RRF 3.2.2.

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                                          • Phaedruxundefined
                                            Phaedrux Moderator
                                            last edited by

                                            Can you post the results of an M122 command after doing a print?

                                            Z-Bot CoreXY Build | Thingiverse Profile

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