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Vacuum Bags for Filament  

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Robin_13
(@robin_13)
Reputable Member
RE: Vacuum Bags for Filament

I put all my filament into sealed bins with alumina oxide desiccant.  No bags and the bins stack.  Just purchased a Sterilite storage bin with a gasket.  Not sure how tight it is.

I usually have to dry my desiccant twice a year.  Humidity in the bins is kept under 20%RH at 22 degrees.  

I did try vacuum bags with no success.  They were cheap.

I have read that the best bags are mylar.

Posted : 05/09/2025 6:50 pm
Artur5
(@artur5)
Reputable Member
RE: Vacuum Bags for Filament

As I've said before, I gave up on vacuum bags altogether. None of the brands I tried was reliable, Now  I store my PLA spools in the original Prusa or Fillamentum resealable bags with desiccant. Those are good and last a long time. I've no idea  if they're air tight, probably not after a while, Fact is that I never had real problems with moist PLA, although I dry all my spools at least once, before they're finished.  Other manufacturers, like most Chinese brands, ship their spools without  a  reusable bag or with a flimsy worthless "resealable" bag, that I discard right away and I put that spool in a spare Prusa bag.

For other types of filaments more sensible to moisture (PETG, ASA, PC, PA, TPU ) I use Printdry vacuum containers.  Not exactly cheap, but they last long and keep a good vacuum for weeks. I've used them for several years and none of them has failed yet,

Posted : 05/09/2025 8:19 pm
Crab
 Crab
(@crab)
Honorable Member
RE: Vacuum Bags for Filament

I'm really rethinking the cardboard stuff now. Most of my PLA and PETG have been coming with cardboard. I just recently opened a 5 mo. old, still vacuum sealed bag from Eryone of green PLA. I had lots of stringing (printed right from opening). Dried for about 5 hours and stringing all but gone, when I reprinted the items.. But I'm not convinced I got all the moisture from the cardboard.. so if I now put into a vacuum pouch with desiccant, I am thinking it will likely dampen the filament. Now the vacuum bags Eryone uses feel the same as Polymaker, e-sun, etc..   The only bags that would prevent moisture creep is mylar and to their credit my last PETG rolls from Polymaker used Mylar. . But drying those cardboard spools is now going to take a long time in my estimation .. and I think it will fill the desiccant in a very short time. I can't see cardboard spools being a good option. I'm going 100% plastic reusable spools. Really starting to think that most filament manufacturers have no idea what it is like trying to keep filament dry in a humid environment. I think Bambu chose the right path in their reusable spools for the humidity issue, and as a cost saving.. 

Posted : 05/09/2025 9:38 pm
Tim
 Tim
(@tim-24)
Member
RE: Vacuum Bags for Filament

 

Posted by: @robin_13

I put all my filament into sealed bins with alumina oxide desiccant.  No bags and the bins stack.  Just purchased a Sterilite storage bin with a gasket.  Not sure how tight it is.

I use ZipLock storage bins, 4 or 6 clips on them and a gasket; Sterilite sells similar.  RH remains under 10% ... and the standard Silica Gel beads pumps the RH back down within an hour after opening to pull a spool. But my typical open RH is only 30-40%, which helps.  I put hydroscopic filament into vacuum bags with desiccant and keep them in the same ZipLock bins. I get about 6 months out of 250g per bin before recharge, so I think the foam weatherstrip used in them is okay. 

Posted : 06/09/2025 6:04 am
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