PETG HF layer adhesion

[user_803031883]

Hello,

I recently received a new P1S, and I’m trying to print PETG HF. I put it in my filment dryer at 50C for 12 hrs. Using factory settings, the quality turns out well, but I’m noticing poor layer adhesion. The layers have a much weaker bond than I previously experienced with Elegoo rapid PETG on my Elegoo Neptune 3 Pro.

My questions:

1. Is this normal?
2. Should I use PETG HF for funtional parts / should i get something else?
3. Can I optimize settings to have excellent layer adhesion?

[MalcTheOracle]

A quick search would have found this thread with lots of views, thoughts and more.

I recommend you move your attention to that.

PETG-HF is a DISASTER imho

A video was posted a few days ago that compares wet vs. dry Bambu filaments, including PETG-HF. I included it in this thread since there has been a lot of discussion about moisture. [WET vs DRY filament: LAYER ADHESION at 5-20 mm³/s FLOW RATES (PLA vs PETG-HF vs ASA)] What was disappointing about the video is that the YouTuber only measured strength, not weight, which to me violates basic Scientific Method 101 principles. How can we know how much, if any, moisture was actually in t…

[user_803031883]

Thank you! Still new to this forum. Seeing that wet filament shows a significant decrease in layer adhesion, that leads to my next question:

If I use PVA supports with PETG HF, and soak my parts in water, does that soak decrease layer adhesion post-print?

[TomWS]

@user_803031883

I put it in my filment dryer at 50C for 12 hrs.

PETG should be dried at 65C. I dry a new spool of PETG-HF at this temp for 2-4 hours before using and have never had a print failure.

[MalcTheOracle]

Fully cured filament post printing acts differently to pre-printed.

Wet filament will splutter out of the nozzle causing adhesive issues as it builds the model, it is that that causes the issues you speak of.

Removing PVA is meant to be fine post print in water.

Again, direct these questions in the other thread.

[Aletsvillalobos]

How often do you dry your filament?

[TomWS]

Welcome to the forum! I’m a relative newbie myself, but have been active is other fora.

@Aletsvillalobos

How often do you dry your filament?

I dry them as soon as I receive them as I generally have an application requiring them. As soon as I think they’re dry, then I’ll either deploy them to the AMS (which is chock full of desiccant or I’ll bag them in a vacuum bag with a mesh bag filled with desiccant beads. I rarely need to redry them as I’ll use them before they have a chance to absorb any quantity of moisture.

The exception to this is when I buy a ‘bundle’ where only some of the spools are needed for the project. The remaining spools are either left in original packaging or, if I do use a little, then I might re-dry if I think the spool has gotten any open air exposure. But, in this last case, I won’t re-dry as long…

I haven’t become ‘invested’ enough to weigh the spools to measure moisture loss…