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Can you tell when the dry filament started being extruded? (lemmy.dbzer0.com)
submitted 2 months ago* (last edited 2 months ago) by ExcessShiv@lemmy.dbzer0.com to c/3dprinting@lemmy.world
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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

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[-] DannyMac@sh.itjust.works 1 points 2 months ago* (last edited 2 months ago)

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 1 points 2 months ago

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.

[-] MrQuallzin@lemmy.world 0 points 2 months ago

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 1 points 2 months ago* (last edited 2 months 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.

this post was submitted on 30 Jan 2026
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