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

    • ExcessShiv@lemmy.dbzer0.comOPEnglish
      3·
      18 days ago

      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.

      • Doppelmembran-Würgenippel@techhub.social
        2·
        18 days ago

        @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.comOPEnglish
          3·
          18 days 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.