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Extruder Motor Getting Hot.

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Tuning and tweaking
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  • undefined
    RAM @jay_s_uk
    last edited by 11 Jan 2021, 18:37

    @jay_s_uk

    I originally had it set to 800 because of the rule of thumb with currents on stepper motors and it was hot and skipping. The skipping seemed to go away when I upped it to 1000 but it was still getting hot even though I allowed it to cool off before using it again.

    I can hold it but then I can hold a fresh cup of coffee so I don't think that will help much but I would say it is probably about 60c - 70c

    I have never had a extruder motor get hot before so I am not sure if this is what is causing the printing issue with the not so good printing results on the longer prints.

    I did run a 4 cube retraction test which was good but it only took about 20 mins to run.

    1 Reply Last reply Reply Quote 0
    • undefined
      jay_s_uk
      last edited by 11 Jan 2021, 18:41

      are you sure your thermistor settings are correct and you're extruding at the right temperature?

      Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

      undefined 1 Reply Last reply 11 Jan 2021, 19:10 Reply Quote 0
      • undefined
        RAM @jay_s_uk
        last edited by RAM 1 Nov 2021, 19:12 11 Jan 2021, 19:10

        @jay_s_uk yes they are set correctly as Phaedrux helped me originally set it all up and I haven't changed a thing since it was built and I have also tried printing the PLA at 190 to 215c

        When I print the PLA at 190c it doesn't make any difference with the extruder motor temp.

        Forgot to mention that I am running the Trianglelabs BMG clone as a bowden and not direct drive. I have also tried using 2 different bowden tubes. 1 no name and I am currently running the Capricom or how ever you spell it version as I thought that maybe the bowden tube was causing issues. I have also put a brand new e3D 0.4 brass nozzle on too and I can feed filament through the throat with the nozzle removed with no issues.

        1 Reply Last reply Reply Quote 0
        • undefined
          Veti
          last edited by 11 Jan 2021, 19:18

          can you measure the resistance of one phase.

          Model no.: 17HS4023
          Size:424223mm
          Phase: 2 Phase
          Voltage: 12V
          Current: 0.7 A/Phase

          from what i can see the motor is 0.7A so 500ma would be better

          undefined 1 Reply Last reply 11 Jan 2021, 19:32 Reply Quote 0
          • undefined
            RAM @Veti
            last edited by 11 Jan 2021, 19:32

            @Veti said in Extruder Motor Getting Hot.:

            can you measure the resistance of one phase.

            Model no.: 17HS4023
            Size:424223mm
            Phase: 2 Phase
            Voltage: 12V
            Current: 0.7 A/Phase

            from what i can see the motor is 0.7A so 500ma would be better

            Well this has thrown a spanner in the works. it looks like there is 2 motors from the same company with the same model number.

            1 is 0.7A and the other is 1.0A which is what I am certain I have but I just removed the motor from the BMG to see the label and the writting is rubbed out but looking at the pictures the labels are slightly different and mine looks like from what I can see is the same as the 1.0A

            1.0A
            https://images-na.ssl-images-amazon.com/images/I/61oCibxPEQL.SL1500.jpg

            0.7A
            https://images-na.ssl-images-amazon.com/images/I/614OmoeLMLL.SL1120.jpg

            1 Reply Last reply Reply Quote 0
            • undefined
              Veti
              last edited by 11 Jan 2021, 19:35

              i believe this is the 1A version
              https://www.amazon.com/Twotrees-Nema17-Stepper-42BYGH-Printer/dp/B07TGJSNJB/

              undefined 1 Reply Last reply 11 Jan 2021, 19:38 Reply Quote 0
              • undefined
                RAM @Veti
                last edited by 11 Jan 2021, 19:38

                @Veti this is definately the version I have which it says is the 1A version from this listing.
                https://www.amazon.co.uk/Usongshine-Titanium-Extruder-Printing-17HS4023/dp/B07L8CGQMB

                I have one of the other motors that I use to drive the X,Y & Z Axis's would I be better off putting that in ?

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                • undefined
                  Veti
                  last edited by 11 Jan 2021, 20:27

                  try the motor with 500ma first

                  undefined 1 Reply Last reply 11 Jan 2021, 20:53 Reply Quote 0
                  • undefined
                    RAM @Veti
                    last edited by 11 Jan 2021, 20:53

                    @Veti said in Extruder Motor Getting Hot.:

                    try the motor with 500ma first

                    Ok will do thanks for the help Veti

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      RAM
                      last edited by 12 Jan 2021, 16:25

                      @Veti I dropped the current to 500 and it seems to have worked. before starting to print extruder motor temp was 21.5c and 36.7 by the end of the print which was a 1 hour 40 min print. I didn't change any of the other settings so that everything was the same as before.

                      The print quality is not great though. the infill is still very poor and so is the surface finish.

                      Would you think it would be a good idea to do extruder and temperature calibrations again now that I have changed the current settings ?

                      This is what the print came out like it is 60mm in height and was printed using .2 resolution.
                      20210112_161107.jpg
                      2.jpg
                      3.jpg

                      If I did the same print on my other printer the quality would be a lot higher.

                      undefined 1 Reply Last reply 12 Jan 2021, 18:28 Reply Quote 0
                      • undefined
                        Veti
                        last edited by 12 Jan 2021, 16:31

                        check all bearing and pulleys. everthing has to be very smooth without resistance.

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                        • undefined
                          RAM
                          last edited by RAM 1 Dec 2021, 16:52 12 Jan 2021, 16:34

                          @Veti everything seems to move ok and I don't have the belts to tight I made sure of that.
                          Is there a recommended way to check or is it more a case of feel ?

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                          • undefined
                            Veti
                            last edited by 12 Jan 2021, 17:04

                            start with something simple like a calibration cube.
                            then go to a retraction test print.

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                            • undefined
                              Phaedrux Moderator @RAM
                              last edited by 12 Jan 2021, 18:28

                              @RAM said in Extruder Motor Getting Hot.:

                              Would you think it would be a good idea to do extruder and temperature calibrations again now that I have changed the current settings ?

                              Yes. I would say that looks over extruded and maybe printed too hot.

                              Z-Bot CoreXY Build | Thingiverse Profile

                              undefined 1 Reply Last reply 13 Jan 2021, 05:03 Reply Quote 2
                              • undefined
                                RAM @Phaedrux
                                last edited by 13 Jan 2021, 05:03

                                Hi @Phaedrux will do that once the test print has finished. I changed the S3D Printing profile and did the 40mm cube which came out quite nice so decided to do something a little more crazy which is going well so far but I'm not holding my breath.

                                Bet you hoped you would never have to deal with this printer again after all the issues I had at the very beginning lol.

                                1 Reply Last reply Reply Quote 0
                                • undefined
                                  RAM
                                  last edited by 13 Jan 2021, 14:00

                                  Honest thoughts on this please with if there is anything that I could possibly do to improve the print quality.

                                  it was printed with Black Real Filament PLA @ 210c & 60mms with 0.4 mm nozzel at 0.2 resolution. no supports, cooling fan set to maximum after 4th layer. Retraction distance 3.50, Retraction speed 150mms

                                  Side
                                  20210113_133543.jpg

                                  Underside
                                  20210113_133611.jpg

                                  Top
                                  20210113_133635.jpg

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                                  • undefined
                                    Veti
                                    last edited by 13 Jan 2021, 14:44

                                    the quality of the underside is determined by the quality of the part cooling.

                                    this print needs a lot of cooling and it has to be focused cooling.

                                    put some water in a shallow container underneath and see where the airflow is directed when the part cooling fan is on.

                                    undefined 1 Reply Last reply 14 Jan 2021, 21:09 Reply Quote 0
                                    • undefined
                                      Phaedrux Moderator
                                      last edited by Phaedrux 13 Jan 2021, 18:35

                                      It also looks very glossy which can mean it's printed too hot.

                                      Look into doing a temp tower test where the temp gets changed at certain points up a tower so you can visually see the results. If the thermistor isn't very accurate when you think you are using 210 it could actually be 240. So in absence of accurate measurements, you can still determine a good set point experimentally. In other words, it doesn't matter if you use 190 or 220 so long as the results look good.

                                      Z-Bot CoreXY Build | Thingiverse Profile

                                      undefined 1 Reply Last reply 14 Jan 2021, 21:12 Reply Quote 0
                                      • undefined
                                        RAM @Veti
                                        last edited by 14 Jan 2021, 21:09

                                        @Veti said in Extruder Motor Getting Hot.:

                                        the quality of the underside is determined by the quality of the part cooling.

                                        this print needs a lot of cooling and it has to be focused cooling.

                                        put some water in a shallow container underneath and see where the airflow is directed when the part cooling fan is on.

                                        20210114_170353.jpg

                                        It looks like the fan is blowing where it should be from what i can see

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                                        • undefined
                                          RAM @Phaedrux
                                          last edited by 14 Jan 2021, 21:12

                                          @Phaedrux said in Extruder Motor Getting Hot.:

                                          It also looks very glossy which can mean it's printed too hot.

                                          Look into doing a temp tower test where the temp gets changed at certain points up a tower so you can visually see the results. If the thermistor isn't very accurate when you think you are using 210 it could actually be 240. So in absence of accurate measurements, you can still determine a good set point experimentally. In other words, it doesn't matter if you use 190 or 220 so long as the results look good.

                                          20210114_171232.jpg

                                          Not sure what you think but 205c looks ok to me and it is also what is recommended on the filament.

                                          1 Reply Last reply Reply Quote 1
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