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.
I like to drop my cooling fan down to 10% and drop my layer hieght slightly for the first 3-5 layers of the prints for PETG. It tends to like to shift a bunch if cooled too quickly. I also have better results on a textured print surface.
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.
I would recommend a textured bed. I also tried PETG on glass but the adhesion is better on a textured bed. I’ve been able to print at 240/70 on a PEI sheet. I have an Ender 3 S1
Make sure is dry as well. I just opened a fresh Prusament PETG Black and it was popping and hissing. Stopped the print. Got my food dehydrator and dried it. Prints well now.
The other advise here is good. I’ll also add that PETG really likes to pop of the bed if the temp changes. Even the breeze of someone swiftly walking by the printer could be enough to get a corner to lift.
An enclosure or tent may help; as a test maybe try a big cardboard box set over it carefully while printing.
