Hey everyone,

I am currently recalibrating my printer after.not using it for a while. When doing a flow test I noticed these blobs forming in the middle of the circles.

AFAIK these are often caused by moistures in the filament. I already dried the filament at 50°C for a couple hours in the oven and the problem persists. So I guess I should simply get rid of the filament and open a new pack?

What’s your assessment?

  • colourlesspony@pawb.socialEnglish
    9·
    6 months ago

    I doubt a few hours is long enough if the filament is really wet. It probably needs like 24+ hours. I would just switch to the new filament to test if that is really the problem. Then decide if it’s worth trying to save the old filament.

  • floquant@lemmy.dbzer0.comEnglish
    2·
    6 months ago

    Might just be an effect of the circular infill pattern, esp. if done outside in. Try again with monotonic?

    • einkorn@feddit.orgOPEnglish
      2·
      6 months ago

      The calibration pattern appears to have a hardcoded top layer. Changing it in the slicer does nothing.

      The calibration page lists some examples which look a lot cleaner. Also, I tried another opened filament that was stored in a closed plastic bag and the blobs are less pronounced. So the third test is going to be a fresh filament.

  • ffhein@lemmy.worldEnglish
    2·
    6 months ago

    If you have a PTFE lined hotend, this kind of blobbing can also be caused by bowden gap IIRC. Might be easier to provide suggestions and ideas if you added some information about what printer you have, what filament it is, and what your other slicer settings are.

  • elucubra@sopuli.xyzEnglish
    2·
    6 months ago

    I’m pretty sure that’s caused by a 3D printer.

    Now seriously, what printer is it?

    You have over AND under extrusion.

    Stock hotend?

  • einkorn@feddit.orgOPEnglish
    1·
    6 months ago

    Update:

    The printer is a Prusa MK4S with stock parts.

    The filament is by recyclingfabric.

    I have run through all relevant calibrations in Orca Slicer and the blobs still happen but only when using these circular patterns. I’ve printer the bracket I designed. Need to further tune the edges but overall it seems good to me: