I built my 3D printer a couple of months ago, but I can’t get it to print sharp corners. The corners in the picture should be 90°, without any fillets:

During this test print, I played with multiple parameters: speed, temperature, acceleration, junction deviation, linear advance. All of these were also individually tuned previously. Nothing seems to make a difference.

Could this be a issue with the construction of my printer? I’m beginning to think my hotend isn’t rigid enough, but then I would at least expect better results at low speeds.

Edit: the printer is a CoreXY of my own design running Marlin 2.1.2.1. The Slicer is PrusaSlicer with most settings left as default (but increased speeds)

  • elDalviniOPEnglish
    2·
    10 months ago

    This is a 40x40 cube printed in vase mode:

    The corners look pretty okay on that:

    But I don’t see these kind of results on real-world parts. I guess I have to print some more test parts to narrow down the problem.

    • rambos@lemm.eeEnglish
      2·
      10 months ago

      Cube looks good, but corners are rounded bit too much I think (at least the one on 2nd pic)

      • rambos@lemm.eeEnglish
        2·
        10 months ago

        Your design CoreXY reminds me on belt issues. Do you have a pic? It doesnt have to be mechanical issue, but belts must be tight and parallel/perpendicular to linear motion system.

        • elDalviniOPEnglish
          1·
          10 months ago

          The belts are parallel to the axis, but I will try tightening them some more.

          • rambos@lemm.eeEnglish
            1·
            10 months ago

            It looks great. Ive seen some bad designs with weird belt paths, but not your case

            • elDalviniOPEnglish
              1·
              10 months ago

              Tightening the belts seems to have helped, but I will have to do some more printing to be sure. Thanks for your help!