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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[–] anguo@lemmy.ca 5 points 10 months ago* (last edited 10 months ago)

Are you perhaps using the new input shaper mode? That one needs higher temperatures (220-230) in order to get proper flow for its increased speeds. Try the default Generic PLA settings.

I second washing your plate with dish soap before you try anything else. Alcohol just kind of pushes stuff around. It's usually enough, but I wash the plates with dish soap once in a while and it really helps.

I also believe that the z-height looks like it's a bit close. Try the built-in Z-height calibration instead of doing it on your actual print. Even better, print a rectangle with horizontal rectilinear bottom layer infill.

Edit: Also, you need to get your hands on some purer alcohol. 70% won't cut it in the long run.