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·
    27 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·
      27 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·
        27 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.