Weird PETG Printing Behavior (imgur.com)

submitted 2 weeks ago* (last edited 2 weeks ago) by csm10495@sh.itjust.works to c/3dprinting@lemmy.world

14 comments fedilink hide all child comments

Hey folks,

I'm not sure what I'm doing wrong. I'm printing PETG (https://kingroon.com/collections/petg-filament?) on my Neptune 3 Plus. It's sort of like it starts (almost) ok, sticks to the plate just fine, then a few layers up it seems to almost have inconsistent extrusion (or maybe even trouble pulling the filament?) leading to holes, etc. till the model just falls apart. See linked photos for about where I give up each time.

I'm printing with Cura and 240C printing, 90C on the build plate. 45mm/s (I've gone down from 60mm/s). Retraction on, no z-hop. 60% fan, though I've tried it with 20% and 100% fan as well.

The filament is in a dryer at 55C. Funny enough I printed basically perfectly (without drying, straight out of the bag) with default settings the first time I printed. The second time and on, have had this problem... and have had it in the dryer.

Any ideas would be much appreciated. Thanks!

Edit: In case its useful, I'm printing this piece: https://file.io/D9jxYq4KOrL7 which is a small remix of a piece from https://www.printables.com/model/130507-bolt-action-pen-for-pilot-g2-cartridges

you are viewing a single comment's thread
view the rest of the comments

[-] csm10495@sh.itjust.works 1 points 2 weeks ago

Weird as heck but without any cooling it printed fully just fine. Thanks for the advice!

[-] dual_sport_dork@lemmy.world 2 points 2 weeks ago

FWIW the default PETG profile on my printer doesn't even run the part cooling fan at all except during bridges. PETG has a very narrow window of suitable temperatures typically between 240 and 260° C, and if you're printing with your nozzle at 240 you're already scraping the lower end of that range. And unlike PLA, especially the modern blends we have now that are full of additives to make the stuff easier to print, there is no leeway. PETG will essentially solidify instantly once it falls below that critical temperature point. Not only underextruding severely (or not extruding at all) but likely also failing to bond to the layer underneath with whatever does manage to make it out of the nozzle.

On my machine you can hear it when this happens, a least. The extruder gears click like mad whenever there's a failure to extrude at any significant volume.

this post was submitted on 18 Oct 2024

17 points (94.7% liked)

3DPrinting

15527 readers

82 users here now

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.

The r/functionalprint community is now located at: !functionalprint@kbin.social or !functionalprint@fedia.io

There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml

Rules

No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
Be respectful, especially when disagreeing. Everyone should feel welcome here.
No porn (NSFW prints are acceptable but must be marked NSFW)
No Ads / Spamming / Guerrilla Marketing
Do not create links to reddit
If you see an issue please flag it
No guns
No injury gore posts

If you need an easy way to host pictures, https://catbox.moe may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is ![](URL)

Moderation policy: Light, mostly invisible

founded 1 year ago

MODERATORS

andypiper@lemmy.world

henry_rowengartner@lemmy.world

j4k3@lemmy.world

GrayBackgroundMusic@lemm.ee