this post was submitted on 02 Jan 2024
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[Solved: wet filament] Help me identify the problem: wet filament, bad z-height, or clogged nozzle? (lemmy.world)
submitted 10 months ago* (last edited 10 months ago) by PlutoniumAcid@lemmy.world to c/3dprinting@lemmy.world
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This is a Prusa MINI+ that has worked flawlessly for 3 months. Suddenly the prints won't stick to the bed, the first layer is all messy and I cancel the print before anything worse happens.

  • The printer has auto bed leveling so I would rule that out.
  • The plate is cleaned with 70% IPA, so it's not dirty either.
  • I have tried to adjust the "Live Z Adjust" while printing that first layer, but no setting works well.
  • Each filament is printed at recommended temps (+/- 215C) and bed is at 60C.
  • Out of my 5 spools, only 1 works well: RepRapper 3-color PLA. Even the Prusament PLA fails to stick well, and also eSun PLA+, and eSun matte PLA, and Tinmorry TPU.

https://i.imgur.com/MEpK37W.png

Update:

  • Thank you all for your kind input.
  • I washed the plate, and cleaned the nozzle (have no spare nozzle).
  • I also did a fresh Z-test (with this object) using Prusament galaxy silver PLA.
  • That was successful and showed that my height was already very close to perfect.
  • Z-test result shows that -1.425 is best. I was off by only 0.025. Image
  • Started printing an object with eSun matte black PLA but the result was same as in my original photo.
  • Changed back to the Prusament galaxy silver PLA and the result is perfect. (image)

So it looks like my filament storage is not up to snuff! Good thing that I only have a few spools, so not much is lost.

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[–] Shdwdrgn@mander.xyz 4 points 10 months ago

I'm not familiar with this printer, but is this a direct drive or fed through a Bowden tube? If Bowden style, then check each end of the tube where it goes into the fittings to make sure there is no play. Clogging is definitely a possibility considering how uneven the skirt printed.

As for your adhesion issues... NEVER rule out bed leveling just because you have an automatic system. Everything can fail, I've actually had to troubleshoot our printer at work before because the nozzle was too close to the bed due to the auto-leveling not reading correctly. Do you have a 5-point bed leveling test print available? Get one and let it try to print, then measure the thickness of the prints to see where you're at. My own guess is that you're too far away and the nozzle needs to be closer.

It would help a lot if you could take a much closer show of your test print at that front curve where it did stick to the bed, and at a higher resolution so we can zoom in and see the details. Without a good photo this is all just guess-work.