What is causing this tearing pattern every so often?

Sovol Zero
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1

I’ve got this odd issue that has started up recently, I just cant figure it out, looking for some advice on a direction to look.

Everything is pretty much stock with areas related to printing PETG. Speeds are slow, it’s just this part of the print at around 2mm. Initially it prints fine, then I look and see it’s torn itself up after I suspect contraction after cooling?. I let the enclosure normalize slowly for about a hour…

I also thought under or over extrusion, but changing that setting does what it’s supposed to do, makes a mess with to much, or shows not enough while printing…

I’m at a loss for what is causing this, chamber temperatures, cooling, something I’m not yet familiar with tuning?. Reaching out for some ideas.

Cheers,
-Mike

Filament: JAYO Rapid Matte PETG Filament (First time using)
First layer test: PASS sheet almost folds in half no breaks/rips between print lines.
Filament: Dried/Drying in dryer at time of print.
Flow Ratio: 0.95
Layer Height: 0.20
Print Speed: 12 mm3/s
Nozzle Temp: 240c
Z Offset: -0.05

odd ripping
odd ripping841×1129 380 KB

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Is this the 1st time using this filament..??
I think your printing too cold.

Usually tearing is the offset is too close, but somethings on the print look like Delamination.
Read this & see if it helps.

3D Print Layer Separation: 8 Tips to Avoid Delamination

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Thanks @lion updated my post, this is the first time using this filament.

I had not thought about delamination, I’ll take a look! I’ve been fighting this for a few days now, just don’t understand why it looks like a pattern tearing itself like that, thanks for the pointer.

Cheers,
-Mike

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I have seen surfaces like that when the bridging layer on top of sparse infill is printed too fast. Then the full speed layers on top of the crappy bridging layer continue to fail.

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I was thinking the same. Similar to the effect of printing PETG, when one’s forgot to switch from the PLA profile to PETG. Not that I’ve ever done that….

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Thank you, @HandyDoodads @Matt/ @Lion This gives me some points to check out.

  1. I didn’t think to check my infill, I have/had it set to 100%, just checked and it was back to 5%.
  2. To cold, yeah, this filament gave me lots of trouble with tuning temps. It’s set at first layer 252, others 240 and the flow ratio is 0.95. If I kept it anywhere above 240 the filament was oozing out just a bit as the print head was moving between points. I can look in this area some more.

This helps, I was starting to look into and focus on settings I generally didn’t see others mentioning for these questions! Really appreciate the suggestions folks! :smiley:

BTW I really like the filament, its nice when it prints, just has these torn looking lines.

Cheers,
-Mike