Struggling with PETG

Bambu Lab X1 Series Bambu Lab X1C
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X1C is the first 3D printer I’ve owned. I have had great luck with PLA and ABS, but PETG just gives me nonstop problems. Based on advice from others I’ve disassembled and cleaned out the extruder (did not have a jam in it), changed all kinds of settings, etc., but I still pretty consistently get junk like the attached pictures.

I’m using the PEI Textured plate, 0.4mm nozzle, and BambuLab brand PETG. I’ve dried the filament, replaced my silicone nozzle sock.

I’m under the (perhaps naive) belief that settings that work for someone else should work well for me, but everything I’ve tried has given variations on bad. I’m considering abandoning PETG and switching to ABS but would rather not because of fumes. If that’s the right answer, I’m willing and able to build a filtration system but seems like an extreme solution.

Anyway, can anyone share settings and/or point to a resource that helped them or worked well? This seems like a solvable thing, but I just don’t have the experience to know what to tweak or why.

On this particular print, I was trying out using PLA as the interface material for the supports, but looks like that failed here too (a bit spaghetti-ish). This was using stock Bambu Labs PETG Basic with the 0.16mm layer height profile. Only change to the profile was to enable supports, specify PLA as the interface material, and set the distance from top of support to next surface to 0mm.

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I had similar issues in the beginning when I stared with PETG. There was a post on this board that linked to a website where the guy listed out his PETG Setting. I gave it a shot and it has worked flawlessly since. So much so I’m almost printing more in PETG than PLA at this point. He doesn’t tweak much, changes the temp a bit and modifies the volumetric speed in the material setting, and basically slows the X1C print speeds down. Its still significantly faster then I was printing on my Ender 3 S1 Pro, so it’s still a win/win. Might want to give it a shot and see how it works for you. Good Luck

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Thank you! This looks like exactly the kind of stuff I need to be going through. I will try it out and report back!

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In my experience, the key for nice and robust prints with the BambuLab PETG is limiting print speed to about 120mm/s or even less.
Other PETG brands that I have tested didn’t have that limitation and I achieved excellent results at 300 mm/s and 20 mm³/s with only 240 °C nozzle temperature. As they cost only 50…70%, I don’t see any reason to buy BambuLab PETG anymore. If you look ar the many topics of people having the aame problem, it seens like BambuLab didn’t make a very good decision with their PETG supplier.
I didn’t have problems with other BambuLab materials so far.

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