Strange lattice/stringing issue – does anyone know this failure pattern?
Hi everyone,
I’m running into a very strange print failure and I’m hoping someone here recognizes the pattern or knows the root cause.
I’m printing a lattice-style model and the outer perimeters seem mostly okay, but inside the structure I get massive random stringing/cross-connections between cells. It almost looks like the nozzle is “drawing” across open areas instead of following the intended paths.
The issue appears consistently on multiple parts in the same print job.
Printer/setup:
Printer: Core One+
Material: PETG
Nozzle: Prusa CORE One HF0.4mm
Layer height: 0.25mm balanced
Slicer: PrusaSlice 2.9.4
Firmware: 6.4.0 (downgrade from 6.5.3 because of failed filament sensor calibration)
Temps: 220°C for other layers (if I use higher temperature stringing occurs)
Filament: Geeetech 220 – 250 °C
What I already checked:
Filament is dry (or at least should be)
Bed adhesion is fine (used clue)
Belts are okay
No obvious clog
What confuses me:
The defect occurred after about 24 hours of printing
Has anyone seen a failure pattern like this before?Any ideas what could cause it?
Thanks in advance!
RE: Strange lattice/stringing issue – does anyone know this failure pattern?
You can turn on show travel in the prusaslicer preview to see what's happening. One thing you can try is turn on "avoid crossing perimeters" in print settings.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
RE: Strange lattice/stringing issue – does anyone know this failure pattern?
if I might add.
You have that you have it at 220c for PETG, and that the filament is dry.
How do you know its dry? did you try drying it already? is it pretending to be the Snap Crackle and Pop spokes elves and making those sounds when it prints?
Did you try tuning / dialing in the filament a bit?
Are you getting the same result with other prints?
Check the model for any errors? (would have a little alert triangle next to the file name on the right side (if using prusa slicer)
Shane (AKA FromPrusa)
RE: Strange lattice/stringing issue – does anyone know this failure pattern?
Thank you very much for the responses 🙂 and additional questions👍:
@FoxRun3D: I will take a look at and test both settings. Thank you.
@Same-old-shane:
- I used a brand-new, freshly unpacked spool of filament. I also unpacked a second spool and it is running in parallel on a P2S printer. The results couldn't be more different (see image below).
- On the Core One+, there is indeed a sort of grinding noise occurring—which is not present on the other printer.
- I did experiment a bit with the filament settings (e.g., material flow). Perhaps not enough?
- Regarding the prints on the Core One+, I am encountering the exact same problem, though sometimes it happens sooner and sometimes later. This morning, the other two prints I had running were ruined as well (see images below). For two of the prints, the issue appeared early on, while for the other two, it occurred about 15 hours later.
- The model itself is fine—I have printed it multiple times already, particularly on my other printer. On the Prusa, it also printed successfully 2 or 3 times just a few weeks ago (using the same filament and settings —which, at that time, hadn't even been dried and wasn't fresh out of the package).
Additional question:
- I recently purchased an E3D ObXidian nozzle. Would swapping out the current nozzle for this one make any difference in this situation?
I ordered a dedicated filament dryer yesterday. As soon as it arrives (which should take a few days), I will definitely address this variable to rule out moist filament as the cause (though, as mentioned, it is working fine on the other printer).
Thank you again for your help!
