Significant Nozzle Build Up

Snapmaker J1/J1s
1

I have started to have pretty significant build up of filament on nozzle. On a 4 hour print, it will accumulate and drop 5 or 6 big blobs. Have not lost any prints so far, but is often very unsightly. Of course, I have run through all factory calibrations over again. Always used Cura as a slicer, I have yet to try luban, but maybe that’s next.

  • Re done factory calibrations
  • Using ABS
  • Have adjusted z hop, no difference.
  • Tried speeds between 60mm/s and 150mm/s, also, not much difference

Any tips would be appreciated.

Edit: paused a print and took this photo. Lots of junk on the nozzle. When this accumulation gets big enough, it will get dragged off onto my model

Snapmaker_20230926_075829
Snapmaker_20230926_0758291411×1164 119 KB

2

Hear any popping as those “blobs” come out?

3

No popping, it looks like blobs accumulate on the nozzle I think due to the nozzle slightly dragging over the printed model while printing, and when they get big enough, they fall off. I thought Z hop was the solution…

Added a picture to my original post

4

You check the esteps for the filament K value or just running stock settings?

Wondering if its a filament manufacturing issue or increase of friction inside the nozzle because the coating is failing

5

Stock settings. I will check…Now that you mention it, I think we started seeing this when we switched over to black abs. We had been using other color abs and never noted this issue before.