this post was submitted on 30 Jan 2026
35 points (100.0% liked)

3DPrinting

21751 readers
4 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: or !functionalprint@fedia.io

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

Rules

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 2 years ago
MODERATORS
j4k3@lemmy.world
andypiper@lemmy.world
GrayBackgroundMusic@lemmy.zip
35
Can you tell when the dry filament started being extruded? (lemmy.dbzer0.com)
submitted 3 weeks ago* (last edited 3 weeks ago) by ExcessShiv@lemmy.dbzer0.com to c/3dprinting@lemmy.world
11 comments fedilink hide all child comments
 

This particular filament (Sunlu matte HS PETG) is one of the absolute worst I've ever used WRT being hygroscopic. It arrived so wet that I had literal steam from the extruder the first time I wanted to use it. It took almost 48h in my drier to dry it completely so I could use it. Its been sitting in an airtight box with dessicant for 5 weeks and I needed to dry it for >16h for it to be usable again. The wet part in this print was in the bowden tube between dryer and printer, I restarted the print after took this image.

Sure it prints well at 300mm/s, but it is by no means matte at the temperatures that allow printing it at high speeds, it is actually very glossy. A huge bummer.

smooth first layer...so nice smooth first layer...so nice

top 11 comments
sorted by: hot top controversial new old
[–] DannyMac@sh.itjust.works 9 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

I've never seen a PETG that isn't glossy. Maybe this stuff is so hydrophilic that the little time it spends outside whatever storage environment you have allows it to get really wet?

[–] ExcessShiv@lemmy.dbzer0.com 3 points 3 weeks ago (1 children)

Probably not, I've seen reviews online (after I bought it) that complains about it only printing matte at lower temperatures but then is isn't possible to print fast anymore.

[–] DannyMac@sh.itjust.works 1 points 3 weeks ago (1 children)

Boo! At that point, I think I'd try to get high-temp PLA if having a matte finish is a priority. What sort of durability are you attempting to achieve with this matte PETG?

[–] ExcessShiv@lemmy.dbzer0.com 1 points 3 weeks ago

I need impact resistance, but more rigidity than TPU can offer.

[–] MrQuallzin@lemmy.world 6 points 3 weeks ago (2 children)

Why do I feel like I live in a perfect little world where my years old filament prints just fine without any special treatment... Sitting here at 45% humidity in the very wet pacific northwest and my PETG prints just fine. I've never understood it

[–] ExcessShiv@lemmy.dbzer0.com 5 points 3 weeks ago* (last edited 3 weeks ago)

This is the only PETG I've ever had this issue with, normally I can just store them with dessicant and it's fine.

Right now RH is fairly low around 30-40% because it's cold and winter, summer its usually around 60-80% here.

[–] stealth_cookies@lemmy.ca 2 points 3 weeks ago

I've got the same experience, never really had any issues with moisture for either PLA or PETG.

[–] gafu@techhub.social 2 points 3 weeks ago (1 children)

@ExcessShiv

Easy, there..

But would you tell the type of filament and the humidity around the printer/the moist material lenght too?

[–] ExcessShiv@lemmy.dbzer0.com 3 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

Its Sunlu HS PETG, relative humidity is a little under 40% in the room (around 25% in the storage box), there's probably about 60-70cm from dryer to extruder. I already purged a good amount before starting the print, but apparently not enough.

[–] gafu@techhub.social 2 points 3 weeks ago (1 children)

@ExcessShiv

I have bought some cheap petg noname stuff which prints without issues at 40% rh in the room.

Another roll transparent petg dont work without drying. Its strange.
Maybe it depends on additives how much water it will get into the material

Very strange.

I see there a lack of information from the manufacturers too. No one specifiy the needed storage conditions

[–] ExcessShiv@lemmy.dbzer0.com 3 points 3 weeks ago

They do state it is more hygroscopic than normal PETG due to additives that allow the fast printing, but this is still significantly worse than I ever expected. I also didn't expect to need to dry it for two days after unwrapping it just to print with it.