#Layer Gaps and Delamination

14 messages · Page 1 of 1 (latest)

naive gull
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Started having serious issues printing PETG as seen in the attached photo. I used to be able to print this fine. Exact filament is Polymaker PolyMax PETG. Main issues seem to be random gaps and artifacts in the layers with some zits and blobs forming. Also layer delaminating along the filet with the top portion of the print.

Print settings:

  • Creality Sprite Extruder, All-metal variant
  • 0.5mm Hardened Steel Nozzle
  • 240C/75C Nozzle/Bed
  • 50mm/s (40 walls, 50 infill)
  • 2mm retraction (direct drive)
  • Z-Hop Enabled
  • 100% Wall flow, 95% infill

I have been swapping between carbon fiber nylons and PETG quite a bit if that matters. I usually do a cold pull and then purge after swapping to avoid blockages.

IMG_1659.jpg
analog anvil
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I've seen walls look like that from going too fast or too cold. Could also be a partial clog from the nylon, heat it up to 300 or so and manually push a ton of petg through, then do a cold pull. Depending on how much CF you used, it may be time for a new nozzle or an extruder rebuild.

naive gull
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I haven’t even gone through a 500g spool of the CF nylon yet

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Maybe like 40% of one

analog anvil
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Could be time for a nozzle depending on what type you have

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Forgot to add temp. Increase your hot end temp 10 degrees and see if that helps. I see a lot of delamination from printing too cold

naive gull
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Alright I’ll kick off a new print with the suggestions and see what happens

karmic falcon
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Are the wall lines side to side sticking together? In other words are the wall lines overlapping or are you getting gaps there also?

naive gull
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They look fine

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Just discovered the filament is apparently very wet. Bubbles at the nozzle while extruding. Weird because I dried this stuff for 8 hours at 70C in a convection oven. Guess I’ll do it again

analog anvil
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Wet could certainly do that

naive gull
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Is PETG that hygroscopic?

analog anvil
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Yes, very. Not as bad as nylon though

naive gull
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So I fully dried the filament and made sure to check it for any moisture issues at the nozzle before printing. The result was better but I’m still dealing with the same gaps and missing sections in the layers. I switched back to Nylon to print some other stuff and it’s perfect. So I’m guessing this is some PETG calibration issue but I’m not sure what else to try