[Solved: wet filament] Help me identify the problem: wet filament, bad z-height, or clogged nozzle?
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.
I forgot until looking at your photo that the mini uses a Bowden tube, not direct drive like the MK3S+. Did you replace/switch the nozzle around the time this all started happening? With Bowden tubes, there are a few problems that can arise that you don't see on direct drive. The end of the Bowden tube (that is inside the extruder/hote end assembly) can get deformed or clogged. If you can check that, you may find an issue. Other than that, when swapping nozzles I always had to put the nozzle in part of the way, then push the Bowden in further, then tighten the nozzle.