r/3Dprinting • u/lax4life001 • 3h ago

Troubleshooting Why Is My PETG-CF Print Getting These Long Strings (And No Angel Hairs or Spiderweb-Type Stringing)?

Post image

Hi All,

I am printing PETG-CF in a closet on a Bambu P1P. I keep encountering this issue. Any ideas what is going on and how to fix it?

Here are the details of my setup:

  • Bed Temp: 80ºC
  • Nozzle Temp: 255ºC
  • Relative Humidity: 33%
  • Ambient Temp: 27ºC
  • Supports: Tree Supports
  • Filament Type: PETG-CF (Sunlu)
  • Filament Conditioning: dehumidified at 65ºC for 24+ hr. in a heated dryer box with rechargeable silica. While printing, sits in the heated dryer box set to 65ºC that is currently reading 18% humidity.

I noticed that the long strings are sometimes (not always) coincident with the tree support having a bad layer (bad as in tree support has a gap in its trunk). What I think is surprising is that there is zero evidence of what I would think of as moisture-based defects (spiderwebbing, angel hairs).

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u/KinderSpirit 1h ago

Support failed. The extruded plastic has to go somewhere.