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    • deckingmanundefined
      deckingman @PuddingBaer91
      last edited by

      @puddingbaer91 said in Requested speed is not reached:
      ................But another problem is the higher Extruder jerk (600mm/min instead of 300). Because of this i hear the extruder and that sound is not cool as with jerk=300. But to get the full speed i need a higher value like you said. Using Bondtech extruder.

      Do you ignore this sounds and is it normal? I read some articles where people use 3000mm/min but i can't imagine how terrible this will sound... Is there another thing i have to adjust to get rid of this sounds?

      600mm/min (10mm/sec is still far too low IMO). I use 3600 mm/min and run Bondtech BMGs (5 of them). I'd expect that with extruder jerk set to 3000+ then you might even be able to get PA down further. What sort of sound do you get? Is it a clicking noise or something else?

      P.S. I haven't looked at this thread for a while but you seem to have made good progress since I spotted that you were using crazy high PA.

      Ian
      https://somei3deas.wordpress.com/
      https://www.youtube.com/@deckingman

      PuddingBaer91undefined 1 Reply Last reply Reply Quote 1
      • PuddingBaer91undefined
        PuddingBaer91 @deckingman
        last edited by

        @deckingman said in Requested speed is not reached:

        @puddingbaer91 said in Requested speed is not reached:
        ................But another problem is the higher Extruder jerk (600mm/min instead of 300). Because of this i hear the extruder and that sound is not cool as with jerk=300. But to get the full speed i need a higher value like you said. Using Bondtech extruder.

        Do you ignore this sounds and is it normal? I read some articles where people use 3000mm/min but i can't imagine how terrible this will sound... Is there another thing i have to adjust to get rid of this sounds?

        600mm/min (10mm/sec is still far too low IMO). I use 3600 mm/min and run Bondtech BMGs (5 of them). I'd expect that with extruder jerk set to 3000+ then you might even be able to get PA down further. What sort of sound do you get? Is it a clicking noise or something else?

        P.S. I haven't looked at this thread for a while but you seem to have made good progress since I spotted that you were using crazy high PA.

        thank you i will try. What acceleration you use for bmg extruder?

        deckingmanundefined 1 Reply Last reply Reply Quote 0
        • deckingmanundefined
          deckingman @PuddingBaer91
          last edited by

          @puddingbaer91 said in Requested speed is not reached:

          thank you i will try. What acceleration you use for bmg extruder?

          Bear in mind that I have 5 BMGs feeding a Diamond "mixing" hot end so my settings might not be relevant to your situation but this is what I use.

          M92 X80 Y80 U80 V80 Z3200 E409:403:407:405:403 ; steps per mm
          M566 X1200 Y1200 U1200 V1200 Z100 E3600:3600:3600:3600:3600 ; maximum instantaneous speed (mm/min)
          M203 X50000 Y35000 U50000 V35000 Z450 E3600:3600:3600:3600:3600 ; maximum speeds (mm/min)
          M201 X1000 Y1000 U1000 V1000 Z100 E3600:3600:3600:3600:3600 ;accelerations (mm/s^2)

          Ian
          https://somei3deas.wordpress.com/
          https://www.youtube.com/@deckingman

          1 Reply Last reply Reply Quote 0
          • PuddingBaer91undefined
            PuddingBaer91
            last edited by PuddingBaer91

            @deckingman said in Requested speed is not reached:

            600:3600:36

            thank you. I wonder why we need these high values. Even the Ultimaker2 only uses 300mm/min for e-jerk?!?

            see: https://github.com/Ultimaker/Ultimaker2Marlin/blob/master/Marlin/Configuration.h

            deckingmanundefined 1 Reply Last reply Reply Quote 0
            • deckingmanundefined
              deckingman @PuddingBaer91
              last edited by

              @puddingbaer91 said in Requested speed is not reached:

              thank you. I wonder why we need these high values. Even the Ultimaker2 only uses 300mm/min for e-jerk?!?

              So what? The Ultimaker2 also has a cantilevered bed that flops around like a field or corn in a breeze. Unless you set it on a concrete slab, you'll likely upset the layer height just by walking past the printer. So I wouldn't hold it up as being any sort of standard to which all printers must aspire (good marketing hype though).

              On the subject of E "jerk", the only time it will come into play is either when pressure advance is used or if it is set lower than the instantaneous speed threshold of the X or Y motors. In that case, all it does is slow the entire print down. "Jerk" is the speed threshold to which axes and the extruder must slow down before a change of direction can occur. In RepRap firmware (which the Duet uses), "Jerk" is not applied to the start of a move from zero speed - only when the print head is moving and there is a change of direction. So before a change of direction can occur, the printer will slow down to the lowest "jerk" speed of either X, Y or E. So unless you want the print head speed to be controlled by extruder "jerk" rather than X or Y "jerk", then set it higher than those two axes. ("Axes" in this case is the plural of "axis" - not something that is used to chop wood) ☺

              Ian
              https://somei3deas.wordpress.com/
              https://www.youtube.com/@deckingman

              1 Reply Last reply Reply Quote 1
              • PuddingBaer91undefined
                PuddingBaer91
                last edited by PuddingBaer91

                @deckingman said in Requested speed is not reached:

                000

                i made a video to show what my extruder sounds like with these high jerk values @ PA=0.6:

                https://photos.app.goo.gl/jUapfqh28hwszUDT8

                It's like the extruder will blow up in a few seconds.

                Can't belive you print also with these sounds. Also the print is not possible as you see. Even with pa=0.1 it makes these sounds

                deckingmanundefined 1 Reply Last reply Reply Quote 0
                • deckingmanundefined
                  deckingman @PuddingBaer91
                  last edited by

                  @puddingbaer91 None of my BMGs make that noise. The movement is visually the same as yours but not the sound. I'd say there is something loose somewhere. Maybe the hobbed gear on the shaft? Maybe the Bowden fitting inside the housing? Maybe worn teeth? Or maybe it's just the Bowden tube a bit loose in the fitting. You need to take the extruder apart and investigate.

                  Ian
                  https://somei3deas.wordpress.com/
                  https://www.youtube.com/@deckingman

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

                    I guess there is also a chance that the motor current is too low to provide the required torque, causing the motor to skip steps when jerk is applied. What motor are you using, and what extruder motor current have you set?

                    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

                    1 Reply Last reply Reply Quote 1
                    • PuddingBaer91undefined
                      PuddingBaer91
                      last edited by PuddingBaer91

                      There should be nothing loose.
                      I use These ACT steppers:
                      https://www.roboter-bausatz.de/2554/act-nema-17-schrittmotor-17hs5425l20p1-x2
                      Current in Data Sheet is 3.1 Ampere
                      It's in German i Hope Google can help

                      Current ist set to 1300mA.

                      1 Reply Last reply Reply Quote 0
                      • Vetiundefined
                        Veti
                        last edited by

                        see
                        https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors

                        So the usual practice is to set the motor current to no more than about 85% of the rated current. Therefore, to get maximum torque out of your motors without overheating them,

                        also

                        Duet 2 WiFi and Duet 2 Ethernet (maximum motor current 2.4A) => Stepper motor rated current <= 3.0A

                        1 Reply Last reply Reply Quote 2
                        • PuddingBaer91undefined
                          PuddingBaer91
                          last edited by PuddingBaer91

                          Okay Data seems to be wrong on the Website. My Motor ist labeled with 2.5A

                          https://photos.app.goo.gl/CSqKTi9TxJZBSTX27

                          Should i ran the Motors near 85% ? 2A?

                          1 Reply Last reply Reply Quote 0
                          • Vetiundefined
                            Veti
                            last edited by

                            @puddingbaer91 said in Requested speed is not reached:

                            Should i ran the Motors near 85% ? 2A

                            yes

                            1 Reply Last reply Reply Quote 1
                            • PuddingBaer91undefined
                              PuddingBaer91
                              last edited by

                              Thank you i will try and Report. But can't Imagine that this causes the Problem because the Motors are already very Strong at 1.3 ampere...

                              1 Reply Last reply Reply Quote 0
                              • PuddingBaer91undefined
                                PuddingBaer91
                                last edited by

                                tried with 2100mA but even with pa=0.1 the same sound but now only at high speed when printing infill. While printing slower the sound is now silent. Tomorrow i will try another stepper for extruder drive and report results

                                1 Reply Last reply Reply Quote 0
                                • PuddingBaer91undefined
                                  PuddingBaer91
                                  last edited by PuddingBaer91

                                  okay also with another stepper (original from TronXY) i get the same sounds 😞 Only reducing jerk to 600 will result in good sound

                                  deckingmanundefined 1 Reply Last reply Reply Quote 0
                                  • deckingmanundefined
                                    deckingman @PuddingBaer91
                                    last edited by deckingman

                                    @puddingbaer91 I say again that none of my 5 Bondtech BMGs make that noise. You said above that "there should be nothing loose" but have you actually taken it apart and checked?

                                    Edit. The only reason why reducing "jerk" helps the sound is that it effectively reduces pressure advance so either don't use pressure advance at all or fix the problem with the extruder.

                                    Ian
                                    https://somei3deas.wordpress.com/
                                    https://www.youtube.com/@deckingman

                                    1 Reply Last reply Reply Quote 0
                                    • PuddingBaer91undefined
                                      PuddingBaer91
                                      last edited by PuddingBaer91

                                      Could you please Share a Video of your running Extruder? I de assemled my bondtech 100 Times also because switching Stepper Motor it seems all perfekt. Also the other Extruder (ultimaker Clone) Made These Sounds...it also makes this Sound with pressure advance = 0.1

                                      Edit: i bought a bondtech BMG Clone to Check If Mine was faulty...

                                      deckingmanundefined 1 Reply Last reply Reply Quote 0
                                      • deckingmanundefined
                                        deckingman @PuddingBaer91
                                        last edited by

                                        @puddingbaer91 said in Requested speed is not reached:

                                        Could you please Share a Video of your running Extruder? I de assemled my bondtech 100 Times also because switching Stepper Motor it seems all perfekt. Also the other Extruder (ultimaker Clone) Made These Sounds...it also makes this Sound with pressure advance = 0.1

                                        Edit: i bought a bondtech BMG Clone to Check If Mine was faulty...

                                        Taken just a few minutes ago and uploaded to my google drive folder.

                                        https://drive.google.com/file/d/1oEaL72FOPDlCzU3uTm2UajcCdYBtXVWL/view?usp=sharing

                                        Ian
                                        https://somei3deas.wordpress.com/
                                        https://www.youtube.com/@deckingman

                                        1 Reply Last reply Reply Quote 1
                                        • PuddingBaer91undefined
                                          PuddingBaer91
                                          last edited by PuddingBaer91

                                          thank you this is what i expect from my extruder 🐶

                                          May i found the problem:

                                          https://photos.app.goo.gl/Krb1Pd1MatLy46S57

                                          look closely to the metal gears. I tightened the screw to max and loosen it till it is possible to move the plastic gear (just a little bit. As you can see the spring is on block (compressed fully). The gears are slipping 😤 if i loosen the srew much more this will also happen. I think this is not normal or what do you think?

                                          1 Reply Last reply Reply Quote 0
                                          • Vetiundefined
                                            Veti
                                            last edited by

                                            have you tightened the grub screw on the gear with the white gear?

                                            1 Reply Last reply Reply Quote 1
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