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
11 Comments
DannyMac@sh.itjust.works · 9 pts · 185d
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 pts · 185d
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 pts · 182d
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 pts · 181d
I need impact resistance, but more rigidity than TPU can offer.
MrQuallzin@lemmy.world · 7 pts · 185d
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 pts · 185d
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 pts · 182d
I've got the same experience, never really had any issues with moisture for either PLA or PETG.
gafu@techhub.social · 2 pts · 185d
@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 pts · 185d
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 pts · 185d
@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 pts · 185d
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.