3DPrinting

The big issue for long term storage and exposure to moisture is hydrolysis, in which over time water molecules infiltrate and alter the polymer chains of the filament, causing the mechanical properties to degrade. Hydrolysis is, to the best of my knowledge, not reversible by simply driving the filament as the water molecules become incorporated into the polymer chain.

That said, simply storing your filament in your vacuum bags and tossing in some dessicant pouches before you seal it should drastically increase the time you can store filament before running the risk of it degrading noticeably.

Personally I just have a large plastic bin with a rechargeable dessicant device that keeps things relatively dry and I haven't had any issues storing filament long term.

I wouldn't bother with vacuum bags If I were you. I think it's fine if you're using a drying box after the filament has been sitting out a while. Doesn't hurt to try and find out at least...

Personally, I just use a big plastic storage bin with a bunch of silica desiccant in it. I just busted out some polycarbonate (notoriously hydrophyllic) recently that had been sitting in there for 4+ months and printed straight away; no stringing or anything.

Instead of those bags with a valve take a look a the kitchen department. They have vacuum seal machines used for sous vid cooking.

This is practically identical to the original packaging and can hold the vacuum for years to come. Leave the bag longer than required to allow it to be resealed multiple times (roughly 3cm are cut with each opening & resealing).

For the frequently used filaments place them in a drying box.

Depends where you live. I live in a desert so humidity isn't an issue, but dust is. I keep most of my filament in bags just to protect from dust. The only one I actually vacuum seal is tpu. Pla, pla+, and petg all do fine without. If I store it for more than a year though, I run it through the dryer first. Or at least have the dryer running while I print from it.

I don't think its a big deal if vacuum bags get lose, they are still protecting the filament. Just vacuum them again and put some silica gel inside.

I printed a few of these: https://www.thingiverse.com/thing:4820432 And bought a few of these: https://a.aliexpress.com/_ExBOJ6F Then store everything in vacuum bags after print. Works great for me!

I live in a subtropical area.

Short answer: YES!!.

I now religiously use a filament dryer, VAC bags and loose silica beads that I bag my self into DIY teabags and then redry in the oven.

I also make sure to dry new filament for 24hours before using it the first time...

Since I started doing this for PLA and PETG, many of my previous my print issues dissapeared...

For PETG and TPU absolutely, for ABS, probably.

For PLA it’s alright. I live in a high humidity area and so PLA left out for a few weeks tends to get brittle or have issues. But in reality even then it’s generally ok depending on the brand.

All that is to say if you live in a high humidity area get a filament dryer (or make one) and maybe a big thing of desiccant beads.

Put those in a tub and dump your filament in there and you’re probably good to go.

I put filament in my dryer and run the filament via PTFE tube to my printer.

So new filament goes in there and dries for a few hours before I print with it.

Anything I’m printing with goes in the dryer out of the tub and is usually fine but if it’s been sitting there for a few days or it's going to rain I run the dryer.

But if its hygroscopic like PETG, etc it goes from a bag into the dryer, the dryer’s run while it’s in there and then back into the bag (along with a small canister of gel beads)

The vacuum isn’t so much of a deal as long as there’s somewhere for the moisture to go hence the dessicant beads.

TLDR: littleblue’s comment + bag up hygroscopic filaments

Airtight storage bins + silica beads = win.