The AMS, with brand new super dry desiccant bags absolutely has no chance in hell of drying this horrible PET-HF disaster for printing. Even 8 hours at 65ºC barely manages it. PETG-HF is a DISASTER. It’s horrible — even when it is thoroughly dried after 15+ hours at 65ºC it prints like nothing I’ve ever seen. A combination of damp ABS abd PLA silk with worse stringing than properly dried PETG Basic. \
Yeah the SUNLU drier isn’t the best at drying filament, I use a food dehydrator and just use mine to print from now.
I did a side by side test against my food dehydrator and the space pi takes 4 x longer to dry filament. So 6 hours in the dehydrator would mean over 24 in the space pi. I found that to get any PETG properly dry in the space pi takes around 36 hours where the dehydrator takes 6 hours and if you print risers for it you can dry several rolls at once.
Now when I receive any filament it gets dried fits before being vacuum bagged and stored.
You can improve the space PI by leaving the lid cracked open a bit, the airflow sucks!.
Turns out I actually used my eSun dryer. In any case, it has no trouble with TPU or Nylon, both of which need to be crispy dry for good prints.
They claim this PETG-HF prints like PLA with less stringing than PETG Basic but that’s objectively untrue based on the single roll I purchased anyway, even when it was thoroughly dried. It maybe prints a tiny bit better in some ways than PETG Basic but there’s nowhere near enough improvement to justify all the extra hassle. Certainly not when other comparably priced materials exist with slightly less inconvenience, cleaner prints, toughness, chemical resistance and so on.
PETG was never the greatest material for printing. I admire the goal of making it better but this product has gone entirely the other direction. I have thrown the remaining 800ish grams in the trash. It’s THAT bad, imo. What were BambuLab thinking?
Descant isn’t going to dry your spools, it just doesn’t have the capacity to draw all the moisture out of wet filament. It is meant to keep the air around it dry so as to prevent the filament from absorbing moisture. Dry the rolls in the printer or a blast oven, then seal them in the AMS or in vacuum bags. If you dry first and store it properly you won’t have to dry it every time you print.
1 Like
It won’t dry spools with much speed by itself but that doesn’t mean water isn’t leaving the filament and traveling to the desiccant. It’s not that different than ice cubes gradually disappearing in a freezer. In a sealed container with desiccant that is “dryer” than the filament, the desiccant will dry the filament.
At room temperature, though, it’s a slow process but it’s still a process. And if your desiccant is “wetter” than the filament, water can move the other direction.
So technically you’re correct but to say that as though it’s a viable way to dry filament is ridiculous. The PETG HF that OP is talking about needs to be dried at 65C for 8 hours. Locking that same roll in a container with desiccant would take months to accomplish the equivalent amount of drying and I can’t even guess how many desiccant changes would be needed. It’s like saying that someone can get a tan from the moonlight cuz that’s the sun reflecting off of it, but it’s a slow process. 
1 Like
You’re in luck. I never said it was a viable way to dry filament. It’s why there are dryers even if they don’t work that well. I only said it happens and it does. Raising the temperature in a dry environment is a good way to dry filament.
OMG you’re killing me. Thanks for the insight, no doubt we all learned a lot from you.
And you’re killing me by trying to pull me into a position I never took. I just said it happens - which it does. It’s from college level general chemistry. Your argument isn’t with me. It’s with not paying attention in class. OMG…
1 Like
So desperate trying to make your case. Next time the discussion is about drying filament don’t offer some inane fact to try and sound smart. The topic was drying filament so the implication of your comment was that it’s a way to dry the filament and I simply called you on it. You’re the one who’s trying to reimagine what you meant. I just love it how some folks keep changing their story to suit the inaccuracies in their comments.
When I compare the printing time of PETG Basic and PETG HF in Bambu Studio, I hardly notice any increase in speed. For example, the printing time for a project with four different, sometimes slightly more complex parts is 7h25m (Basic) and 7h22m (HF). Am I doing something wrong or what is the reason for this?
The print speed can vary depending on the model size, geometry and settings.
To provide a better solution, it is recommended to share more information about the model tested, profiles used, settings and if possible, the .3mf file.
Okay.
Bambu Lab X1C 01.08.02.00, AMS 00.00.06.44
Bambu Studio 1.9.3.50,
Konfiguration Bambu PETG HF @BBL X1C
File
NotFasterSince1984.3mf (795,4 KB)
Well hey there again. I see you couldn’t leave it alone. Science must not be a strong suit if it upsets you like this. I actually do have experience with this and do know what I’m talking about. And nothing I said was inaccurate or trying to hide behind the facts as you understand them.
The fact is (go ask a chemistry teacher if you need to) that desiccant at room temperature can remove water from filament - if the filament is sufficiently wet and the desiccant is sufficiently dry. There are curves that show you what water content in a desiccant results in what kind of ambient humidity. There are lots of articles on how it works in the museum and archives publications about using desiccant to increase humidity in displays for things that last longest at certain humidities. It’s not magic and it is well documented. Not magic.
Any hygroscopic material will absorb/adsorb and give off water depending on the ambient humidity. Filament is hygroscopic and so is desiccant. What matters is how wet or dry the materials are and which “wants” the water more. It’s dead simple and you simply do not know what you are talking about.
Now you are parsing my statements in a context you want to impose so your statements can be correct. But unfortunately your statements are still wrong. Desiccant at room temperature will dry filament. Not well. Not fast. But desiccant will if dry enough. It’s a fact. I don’t know why that bothers you so much but it is true. Get yourself some fresh dry desiccant, a scale, and a roll of filament that has been sitting out and weigh the filament and desiccant and do the experiment. Put them in an impermeable container and let them sit for week. Then weigh them again and see which lost weight and which gained. It won’t be by a lot. It’s why the filament dryers use heat. But dry desiccant will remove water from filament that has absorbed water.
Try it or I’ll explain it to you again. 
You should just let it go, Crab. You weren’t even part of the original comment. You joined in with incorrect and hostile assertions and it didn’t go your way. And it won’t. It’s p-chem. And you can verify everything I said in your own home. You just need an air and water tight container and a good scale. There is no magic. No deception. No lying. I wish you would prove it to yourself. A good scale seems more important these days with the precision of these printers anyway and they aren’t very expensive.
Thanks for making my point for me. You strike me as an arrogant nitwit that thinks himself better than everyone else. The dumb advice you gave, and the fact that you are continuing to aggressively argue how right you are, points to some deeply rooted emotional problems.
For the record, I never said it wouldn’t dry that way, in fact, I simply said it was ridiculous that you would offer that advice as a drying solution.
I never said that desiccant by itself wouldn’t lower the moisture level, I said it was a dumb advice to give the guy that was asking for the best way to dry his filament.
And when you just go overboard on the insults to try and intimidate your adversary, it’s just pathetic, if you had a valid argument to begin with, you wouldn’t need to insult others to make your point.
If you don’t get that then allow me to point out how you pick small excerpts from what I said, which you take out of context to rationalize your argument. And when you try to assign emotion to what other say, such as you’re really angry about this, you’re simply revealing how you are feeling about it. It’s just very small and petty behavior.
These things were all covered in a book I read on how to manage an 8 year old having a temper tantrum. Good luck with growing up. Hopefully, with some hard work, you can work on your personality then you can move out of your moms basement like an adult.
Let me remind you of the forum guidelines. You are welcome to debate topics but personal attacks and name calling will not be tolerated. This is your warning.
2 Likes
As seen in the model shared, the Max Volumetric Speed is not the limiting factor.
For most of the print, the Volumetric Speed requirements don’t reach the limits of PETG Basic or PETG-HF, which is related to the 0.12 mm layer height used.
If a larger layer height is used, like 0.2mm, the speed difference will be more visible between the filaments.
1 Like
No, I never said room temperature with desiccant was an effective drying technique. You can say it as much as you want but it is not true. You are claiming I said that but I did not. Go refresh your memory.
The reasons I don’t let you get your way smearing and trying to bully is you are incorrect. You are incorrect that I said it was efficient or a good way to dry filament. I never said that. You said I did but I did not.
Let’s see what I said that you have such an issue with…
Did you miss the “albeit slowly” or do you just not know what that means? I never said it was fast. I never said people would want to do it. I did say it was slow and I did say it happens.
Both of those statements are correct. It is slow and it does happen. It’s a fact, Jack. The reason I keep saying it is you keep lying about what I said and denying that it happens. You apparently are phobic for any kind of facts or being wrong. You don’t know what you are talking about and insist on showing the world you don’t understand equilibrium.
And the one cherry picking is you. It’s how you miss me saying the water will move slowly. Let me emphasize - I said it happens slowly, and in case you still think I’m advocating drying filament with desiccant, I am not. I don’t know how I can be more clear but communicating with the comprehension-challenged is tougher than pulling water from room temperature filament.
But maybe you are confusing something else? You can dry air at room temperature and then use that dry air in a filament dryer to dry filament quickly and effectively. You are just leaving out a step or two and upset about that?
Dude, you inserted yourself into a discussion to attack what you misunderstood. You didn’t read what I said or you were blinded in whatever anti-sciency talk issue you apparently have, but you got it wrong. You’ve been wrong all along and you are wrong now. I don’t know that repeating and quoting what I said that proves your accusations wrong is going to help you. You went way down this rabbit hole and have staked everything on misquoting me and misinterpreting what I said.
Get a scale, a poly cereal box, and a roll of filament and do the experiment yourself. I’ve never met a person who insists on misquoting and arguing a point that was never made. It’s really bizarre you behave like this. I think it’s time to just mute you. You are contributing nothing and wasting people’s time.
Here, a last quote before you get muted - sufficiently dry desiccant will dry filament at room temperature. It’s simple equilibrium stuff. Equilibrium says nothing about reaction rates, though. It’s a slow process and not practical for our uses. It is just a fact of how things absorb/adsorb and release water. That’s all it is and you don’t need to be scared of it. It won’t bite you. You know, knowing a bit about how the real world works can be handy and even get you out of a scrape. Science, baby. Deny it at your own peril. By the way, news flash - the earth isn’t flat either.
Buh-bye.
1 Like
Well, not to change the subject or anything, but I got myself some of the PETG-HF to try it! Been watching the advice people have been giving. I got myself a Sunlu S4 (I’m not getting too fancy with it). I think I’m ready!
I’m going to print my side table in PETG-HF. I printed the second iteration of the thing with PLA Silk; my first time using that. I’m not as confident that’ll stand up as well to the body slams my cat likes to give furniture when running around.
4 Likes