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

    Tuning and tweaking
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    • dgrat
      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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      • Veti
        Veti last edited by

        do post the stepper driver specs.

        at what current are you running them?

        which duet?

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        • dgrat
          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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          • dc42
            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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            • Veti
              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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              • dgrat
                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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                • Veti
                  Veti last edited by

                  measure the phase resistance to confirm.

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                  • dgrat
                    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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