3DPrinting

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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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Tips for PETG? (self.3dprinting)

submitted 1 year ago* (last edited 1 year ago) by WhosMansIsThis to c/3dprinting

25 comments fedilink hide all child comments

Im very new to 3d printing and this is my first time using anything other than pla. So far all of my prints are lifting off the bed at the corners. They start off looking beautiful. No stringing, great adhesion, etc. But after a few layers, they start to come off. Especially on larger prints.

Heres my setup:

Ender 3 pro with skr mini e3 v2
Creality Ender 3 glass bed upgrade
Bed temp: 90C
Extruder temp: 240C
Nozzle diameter: .4
Layer height: .2
First layer: .45
Speed: 60mm/s
Slicer: Silc3r

I realize that asking this question is like asking WebMD to dianose my sniffles, cause it can literally be anything, but Im hoping someone with more experience can give me some pointers on what works for them. Thanks yall!

Update: First of all, thank you all so much for the kick ass suggestions! I really appreciate all of your replies. Since pretty much everyone recommended it, I went ahead and got a textured spring steel PEI plate and holy shit, it didn't disappoint. Adhesion has been fantastic. I also ended up lowering my bed temp down to 75 from 90 and pushing my hotend temp to 245 for the first layer, then back to 240. I got an enclosure to help keep the plate clean but I also stocked up on some blue dawn dish soap. I still have a little more trial and error with print speed and cooling but I'm literally getting the best prints I've ever gotten thanks to all of your suggestions. Yall are awesome and I'm really glad I posted here.

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[–] [email protected] 3 points 1 year ago* (last edited 1 year ago)

You need to raise your z-offset. PLA should be squished onto the bed. PET-G needs to be laid down neatly. If you try to squish it then the next layer snags on it because it's tacky and it causes it to lose adherence. Raise your z-offset by 0.02-0.15mm. It'll require some experimentation.

You also need a much hotter bed. I use 60c for PLA and 90c for the first layer of PET-G and then 85c for every other layer.

Ultimately what worked best for me was getting a spring steel bed surface. I never had much luck with PET-G on the glass or default bed surface. As soon as I got a spring steel bed all of my problems were solved.