3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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That's so strange, I have no problems printing PETG all the time. Like I said, I have different PEI sheets for my Prusa printers - smooth for PLA, textured and satin sheets for basically everything else. Honestly though I probably print PETG 95% of the time, I only use PLA plastic for prototyping because I have a lot of rolls just sitting around.
What are you cleaning the bed with? What kinda printer?
Yeah, I don't know - I've never had any big issues in the past with it either (I mostly print PLA+ though, unless I need something more heat-resistant for my car or outdoor use).
This particular issue was with an Ender 3 V2 running a BLTouch and an aftermarket textured PEI sheet in an enclosure - so there were no drafts or anything that would explain the bad adhesion either. Just scrubbed it with some water and dish soap. That was literally the only thing I messed with between the spaghetti result run and a great first layer run, so I figured I'd mention it in case it might help OP.
Ahhh, see from my Zortrax printer I learned that PETG benefits from no enclosure - drafts are fine. It actually helps increase print quality. I run my Prusa Mk3s printers with no enclosure (since I only use them for mainly PETG and TPU, and occasionally PLA). I have Zortrax printers for my ABS, ABS/PolyCarbonate Blends, and HIPS plastics (but holy hell I hate the closed software on the Zortrax printers and their Zsuite slicing software - absolute garbage which cripples printers that cost thousands of dollars - I can't even tweak temperature, fan speeds, flow rates, etc mid-print like literally every other printer I've handled over the past decade!).