Bambu PETG-CF

Bambu Lab P1 Series Troubleshooting
1

Hello,
I am having difficulty printing with the Bambu PETG-CF on the p1p. I am using a 0.6mm nozzle and am experiencing non-stop collection of material around the end of the nozzle. For very short prints its fine, but anything longer than ~30min the collection gets to the point where it cover the entire nozzle. I attempted to modify the stock profile for PETG-CF to reduce the flow ratio down to 0.92 as well as doing a calibration and arriving on a 0.007 k value. Unfortunately this had little to no improvement. All other parameters of the PETG-CF profile are stock.

Thanks,
Andrew

2

Seems like there is a lot of quantum fluctuation going on in this filament. My spool of BBL PETG was UNDER-extruding and after tuning, I had:

  • Flow rate: 1.034
  • Pressure Adv: 0.042

Which worked fine for the 0.4 nozzle at least as far as surface quality goes. It still sucked at bridging & overhangs. Then I swapped in a 0.6, and it was over-extruding now. I had to recalibrate the filament with the 0.6 nozzle and got:

  • Flow rate: .9627
  • Pressure Adv: 0.038

WTF?

BTW, PETG is notorious for sticking to the nozzle.

WRT suggestions, it’s hard to say what the issue is given how bad (IMHO) this filament is, but here goes:

Filament settings:

  • increase fan speeds. This will negatively impact strength, but you’ll collect less material if you can get it to dry faster. Try going to 100% all the time and see if that helps. If so, you might be able to dial it back. I was successful with
    Min: 40%/30 sec
    Max: 100%/8 sec
    I would try the fan speeds first.
  • enable retract on layer change
  • enable wipe while retracting

Process settings

  • turn off “reduce infill retraction”
  • lower the print temp a bit
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