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    Problem with a printer (stepper driver? or motor?)

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    • dgratundefined
      dgrat
      last edited by

      I have two printers, which are identical. The only difference is that the left one uses 0.9° steppers, and the right one 1.8° steppers.
      The one on the left (0.9°) produces crap prints. On the first glance, the print looks like there is a mechanical issue, but the slider move fine and there is not much play. Additionally, the print also looks crappy, if the print speed is 50% slower. Could it be a stepper driver or motor issue?

      1_1557569654937_2019-05-11 12.09.08.jpg 0_1557569654937_2019-05-11 12.09.26.jpg

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      • Vetiundefined
        Veti
        last edited by

        do post the stepper driver specs.

        at what current are you running them?

        which duet?

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        • dgratundefined
          dgrat
          last edited by

          It's the Duet Wifi on both printers. The print result is crap for the left one with 800-1700 mA per phase.

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          • dc42undefined
            dc42 administrators
            last edited by dc42

            Please post the stepper motor specifications, also we need to know what VIN voltage you are using and what your microstepping settings are (post the config.g files).

            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

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            • Vetiundefined
              Veti
              last edited by

              to rule out any mechanical issues you could just move the 0.9 steppers over to that printer.

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              • dgratundefined
                dgrat
                last edited by dgrat

                Well, I use a 24V system for both printers.

                The motors of the problem printer should have these specs:
                0_1557593847326_852eb659-f916-413e-8f7a-effbd65b23ac-grafik.png

                However, I just got the feel that I did not get the type of motor I ordered. My look different in comparison to the Aliexpress offer 😕
                I make another post after I exchanged the motors with some from amazon and test again..

                My motors:
                0_1557594616918_2019-05-11 19.08.27.jpg

                Order picture from Ali:
                0_1557594627791_4ded2261-edfe-46b1-9784-0ce74dc6004b-grafik.png

                Feel like, my try on 0.9° was really not worth it 😄 First batch of motors was total desaster, now I probably got entirely different ones. I bet this is the issue.

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                • Vetiundefined
                  Veti
                  last edited by

                  measure the phase resistance to confirm.

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                  • dgratundefined
                    dgrat
                    last edited by

                    My Fluke sais I have a phase resistance of A) 1.8-1.9 Ohm and B) 2.0 Ohm.

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