OVV3D Filament Storage Bags 30pcs, Plus Size 32X34cm 3D Printer Filament Storage Bags Vacuum Sealed Kit with 30 Desiccants, Auto Pump,Perfect for 3D Filament Storage or Using After Filament Dryer Box

This is my absolute favorite brand of bags, as they work consistently, they last for tons of uses before the seal wears out. This vacuum is superior to all of the other types and brands that I've used. I will not buy any other brand of bags for my filament.

I’ve used over 100 of these bags and counting and I keep coming back for more. I use the clip to ensure the bag is closed, a battery-powered pump to suck out the air, and I rub my finger over the vacuum port to ensure it’s sealed. Since I’ve started buying these they increased the size of the bag slightly so inserting the spool into the bag is easier. Occasionally a bag doesn’t hold a seal after multiple open/close cycles. When that happens I open and re-seal the bag and try again. If the bag still won’t hold a seal I throw it away. This doesn’t happen very often. At least one of my printers is printing day or night and keeping the filament dry helps ensure the best prints. I’m completely happy with the performance of these bags and as you can see from my pictures I have a bit of experience with them. 😆

There are numerous glowing reviews here, so perhaps I got a "bad batch", but these bags have been useless for me. The vacuum pulls very, very slowly, but I didn't expect a small hand vacuum to be all that powerful so that's not my complaint. I was able to use it on a few bags, but what I ran into is the vacuum not being strong enough to pull air out of the bags at all. Thinking it was the weak pump, I purchased a small hand-vacuum and that didn't pull air out either. This morning, I finally did a bigger test and tried to pull air out of 15 of the bags (new out of the box and therefore previously unused, with a spool of filament in them) with the hose attachment on a full-size floor vacuum cleaner and it didn't do anything on ANY of them, which tells me these valves are not working at all. It does seem odd to me that the first few bags I used worked okay (and have maintained great seals), but that other bags later have been failures. They have been stored at room temperature in a dry environment.

I am fed up with buying bag kits with a pump, i dont need any more pumps! This kit supplies plenty of bags at a good unit cost without unnecessary items provided you have a pump or 10. Sure the bags dont last a lifetime but i dont expect them to, thats why i want 50 bags, because i have lots of filament and i take rolls in and out all the time. BTW - it seems that the latest batches of bags are now slightly smaller - not these - these ines are still the old size making it easy to get the rolls in. I will be buying more of these kits, hope the seller doesnt stop doing them!

THE BAGS: The bags seem well-made, and they hold a vacuum even after several uses, which is more than I can say for the SUNLU bags I bought. The problem is, they're barely large enough for typical FDM filament spools. You have to squeeze the widest part of the roll through the opening, which always feels like you're going to rip the bag at the seams. Once the spool's in place, there's not really enough room to get the vacuum pump flat on the bag so it will seal. It's a bit of a challenge getting the material just right. If the bag were 10% larger, it'd work a lot better. The kit also doesn't come with enough bag closing clips to go around, so you can't just leave clips on the bags; you'll have to move them from bag to bag as you open them. That's annoying. You can get just the bags, which is good. Some competing products, like the SUNLU, are only available as kits with a pump, which is wasteful. THE PUMP: I've bought this kit with both the manual and powered pumps. The manual pump is, frankly, a bad joke. It's too small, takes forever, takes too much effort, and feels like you're going to break it. There's nothing attaching the pump to the bag, so you have to hold it just so to maintain a seal, while pumping it. The pump moves a small amount of air, so you have to pump for 30 to 60 seconds to remove enough air. It's exhausting. The SUNLU pump (which isn't compatible with these bags) evacuates their bags with 3-4 strokes, because it's a lot larger. The automatic pump works, eventually. It takes as long as doing it with the manual pump, but without the effort. The thing is, the pump gives off an overheated-motor smell that makes me wonder how long it'll last. It charges via Micro-USB; a cord is included but not a charger. It gives no indication of battery percentage, nor does it give any indication that it's done charging. (I wonder if it just keeps charging the battery, which would be bad for battery life.) THE DESSICANT: It's silica gel, which works better than clay-based. But it's not reusable and has no indicator function. It'll work, but you're better off substituting indicator-based, reusable silica-gel packets.

So far these have worked great for storing filament. I have a desiccant core I put in the spool hole before sealing.

I started out loving these bags and pump. They sealed well and never leaked. However, a few months in and maybe a couple dozen uses, the pump barely suctions. I’m guessing an internal seal broke or something because the motor still sounds like it’s pumping.

I've used a few different dry-box storage options, and this one has worked the best for me for longer term storage. I've used about 10 or more bags already and only one hasn't held a vacuum very well. All of the others have stayed very tight for several weeks and appear that they will last for a long time. The bags are a bit tight getting the spools of filament in them. Don't expect to get a large spool in them, but the average size ones do fit. The vacuum pump works very well and will bend the filament spool sides in on partial rolls if you let it. It pulls a much higher vacuum than any of the other pumps I've used before and it gets a great seal on the bag when pumping. The only thing I have to do is remember to raise the bag a bit on a flat object where the pump seals so it will stay flat when getting pulled in tight. I'll definitely be buying this again if I ever need more bags. But since they are reusable, it may be a while before I need more.