Weird extrusion issue



  • Hey,

    I've ran across a weird issue on one of my machines. It seems the extrusion becomes inconsistent for unknown reason. I have an exact same machine right beside this one and i don't have this issue. It's not related to any axis because the pattern repeats in a spiralling motion.

    Temperature is constant at the dyzend, nimble is properly installed, extrusion length is calibrated, layer fan is off, printer is all square, z rods pulleys are centered, i've deactivated auto-levelling compensation, changed nozzle, tried different materials, played with slicer settings.

    The problem appeared lately... It seems to have started when i started printing PETG but i disassembled the hot end and cleaned it and switched to a new nozzle. On the blue part when i raised the extrusion factor from 100% to 102% the pattern started to show. Any ideas?

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  • @3d_low said in Weird extrusion issue:

    I have an exact same machine right beside this one and i don't have this issue.
    ... It seems to have started when i started printing PETG

    Please just confirm, same filament with same settings on the other printer does not show the issue?



  • @robm said in Weird extrusion issue:

    @3d_low said in Weird extrusion issue:

    I have an exact same machine right beside this one and i don't have this issue.
    ... It seems to have started when i started printing PETG

    Please just confirm, same filament with same settings on the other printer does not show the issue?

    Nop, the other printer is fine. I’ve tried multiple filaments and it’s really just this machine. Config is copy pasted (except PID settings which are close and machine name). Both machines are exact twins



  • https://youtu.be/G2Nf2hVhOwI

    Video showing what seems to be the issue. The vibration in the cable is the same even if the nimble is unmounted or not pushing filament.



  • @3d_low said in Weird extrusion issue:

    https://youtu.be/G2Nf2hVhOwI

    Video showing what seems to be the issue. The vibration in the cable is the same even if the nimble is unmounted or not pushing filament.

    Can you explain what parts of the printer are supposed to be moving in the video? Seems like just the hotend fan?



  • @robm

    The flex cable is slowly moving inside the tubing. I realized that the nimble casing is not closing itself properly. Perhaps the casing deformed when I printed ASA with it.


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