Hey y’all, I managed to hack together a printer from scratch and I’m struggling to get it to print well. It’s a CoreXY system that’s being controlled by a Octopus 1.1. Dual z screws, the works.

I have it moving under it’s own power and all. It’s able to actually print, but the results are atrocious.

I’m just trying to diagnose what’s wrong here.

The bottom/first layer actually looks kinda good. It’s just completely shredding subsequent layers.

Any advice would be appreciated!

  • franzfurdinand@lemmy.worldOP
    link
    fedilink
    English
    arrow-up
    1
    ·
    10 months ago

    I’d be surprised if it was too cold, but I’ve heard stranger. This is PETG at 250. I’ve actually pulled the nozzle and Bowden tube and pushed a very small Allen key through, so it shouldn’t be clogged.

    Z height is calibrated, and I’ve calibrated the e-steps for the z axis. I’ve tried disabling the fade height to see if that was doing something but it didn’t seem to make a difference.

    I ran through calibrating the extrusion e-steps. It’s feeding 100mm when I tell it to do so. I haven’t messed with the extrusion multiplier, do you have any information about that?

    • IMALlama@lemmy.world
      link
      fedilink
      English
      arrow-up
      2
      ·
      10 months ago

      250 for PETG

      This is quite toasty, at least for the PETG I print. I’m usually at around 240 for my first layer and 230 or 235 for all subsequent layers.

      Have you run a temp tower?

      I haven’t messed with the extrusion multiplier, do you have any information about that?

      https://ellis3dp.com/Print-Tuning-Guide/articles/extrusion_multiplier.html for more info. In a nutshell, you lower it for oozie filament and increase it for more viscous filament. For PETG I lower it some, but the exact amount varies by filament brand and color.

      That said, I don’t think this is your issue.

      • franzfurdinand@lemmy.worldOP
        link
        fedilink
        English
        arrow-up
        1
        ·
        10 months ago

        I haven’t run a temp tower. I’m not fully convinced that it won’t damage itself so I’ve been trying to think through it before trying another print.

        • IMALlama@lemmy.world
          link
          fedilink
          English
          arrow-up
          1
          ·
          10 months ago

          If you are suffering a clog and/or under extrusion issue the worst I’ve ever seen happen on my printers is the extruder clicking because the e-stepper is trying to step, but can’t. It might not be a bad idea to go over all the connectors in that path. When I finished building my Voron one of the factory terminals in the LDO stepper’s connector had a terminal that was backed out, causing weird extrusion issues.

          • franzfurdinand@lemmy.worldOP
            link
            fedilink
            English
            arrow-up
            1
            ·
            10 months ago

            The print before this one, the blobbing/shreds were tall enough that one grabbed the BLTouch probe and bent it a little. I was pretty mad about that tbh.

            I’ll double check my connectors. That’s a solid shout actually.

    • TwanHE@lemmy.world
      link
      fedilink
      English
      arrow-up
      1
      ·
      9 months ago

      You only calibrate E, calculate for XYZ.

      Calculate the rotation distance for the Z, if it doesn’t move the correct distance when asked you have a broken part.