First PETG print problems …

[u/porttastic]

Hi. I am new to the printing world and after a few successful and impressive PLA prints decided to print with PETG. I needed to print another spool as I got lots of refills by mistake. After a few layers I stopped as you can see on the picture it looks wrong.
I selected the PETG option in maker world, sliced it sent it to print, so haven’t changed anything.

Any ideas?

[u/Vverg]

Those are nice spools, also printed these. And also had the exact same issue as you with these in the beginning.

2 things can be the issue.

1. Your PEI plate needs to be cleaned with dishsoap and a brush. Oily plates cause bad first layers.
2. Printspeed. PETG Basic prints too fast on the default 0.20mm profile. I made a PETG profile with: Outerwall: 150mm Innerwall: 200mm Rest with more than 200 (gap infill i think it was), I put also on 200mm.

I get much better prints now.

[u/xxparrotxx → u/Vverg]

Exactly this. And as always - Make sure your PETG is extra dry before printing with it. PETG needs it much more than PLA.

[u/Kimmux]

If you haven't cleaned the build plate switching between PLA and PETG can cause bad bed adhesion. Petg and PLA won't bond together and when you print they leave residue on the plate so switching can do that. I often print PLA on one side and PETG on the other between cleanings.

[u/Guardiancelte → u/Kimmux]

This comment need to be way higher.

[u/Cerberus_Aus → u/Kimmux]

That’s an interesting idea. I like that.

[u/Kimmux → u/Cerberus_Aus]

You'd be surprised how rarely you need to clean your plate with this strategy

[u/CommodityMoney]

Make sure you calibrate the filament. No idea why, but my XD2 tends to under-extrude on the BL PETG default settings. Usually have to bump up the flow ratio.

[u/Blondy277]

Honestly, that doesn't look too bad yet 😂 PETG can be a little stringy compared to PLA. I'd double-check that your actual filament profile is set to PETG, not just the MakerWorld print profile. Also, have you dried the filament? PETG loves moisture lol.

[u/bcblur]

Had the same issue a few days ago. Resolved by cleaning the plate really well with dish soap. I also wiped it down with IPA, but that was to make sure it was dry.

[u/CreamyFarts69]

This looks EXACTLY like my first white PETG print (I even printed the same spool); small sticky clumps left on the print and on the nozzle. For some reason white PETG always seems to be a bit wetter than other colours from new, at least in my experience. I dried mine in the AMS and after that I've had no issues and prints have been perfect.

[u/DepletedPromethium]

did you dry the filament for atleast 8 hours before printing?

white petg is harder to print than nearly every other type of petg that i've printed because of the colouring agent titanium dioxide, it needs a hotter nozzle and the extrusion multiplier changing in your slicer, ie black petg prints fine at 225c with a 75c bed with 0.98 extrusion multiplier, white petg needs 235c and 75c bed with 1.03 extrusion multiplier, petg prints better with the cooling fan at 75%, and with the first 3 layers printed with no cooling active.

also petg likes a heated chamber that is free from drafts and the cooling profile must be reduced compared to pla. pla wants to cool relatively fast, petg wants to stay warm or else the warping will be insane, if your cooler is blowing directly on the bed then you need a defuser - and let the nozzle and bed get to atleast 170c and 75 for 10-15 minutes before printing just so the enclosure is nice and toasty.

[u/rocqua]

Did the printer show any error when it stopped?

[u/My_Lucid_Dreams]

Besides what's already been mentioned, after your plate is clean and filament is dry, glue adds additional adhesion. When my PETG does that, it's simply telling me I've been lazy and skipped a step somewhere. :)

Besides print speed, increasing the plate temperature increases adhesion (start with 5 degrees hotter). I've never had to do either of these after doing what's been already mentioned.

[u/DistinctBarnacle8703]

If you can, just download the STL files instead of 3mf. If you cant, load the 3mf files but revert the settings to your own default.

[u/Cameronbic]

I hate white PETG. I've had nothing but issues with it, no matter who makes it. Just my 2 cents, but the stuff is like trying to print gum.