POLYMAKER3D Printing Filament Storage Box - PolyDryer Box for Continuous Filament Sealing and Protection, 3D Printer Filament Holder Compatible with PA Nylon, PLA, PVB, PETG, ABS, TPU 1.75mm 2.85mm

The polydry box is very good. I tossed the provided dessicant, and went to color indicating desiccant. I added a couple of drawstring mesh bags filled with dessicant and tuck it in under the lid when it is not in use, it drives the humidity down to 15% in about 24 hours. I live near the ocean with foggy nights, so pretty damp. I added a 10mm hole out the lower back and relocated the grommet and tube for use with my Ultimaker printer, it feeds smoothly with the nice bearings. My prior home made box only stayed dry for 4 days, now the polydryer box seals are excellent and holds the dry level for several weeks at 12-15%. The PLA material no longer turns to glass and breaks apart when humid/wet, the PLA stays compliant and useable and this box really extends the useful life of the print material. The print jobs have been very consistent with no threads, reliable prints every day for weeks. Being clear all around, makes it easy to see the material level. The humidity sensor is a nice touch. Bought a couple of extra containers.

The Polydryer Filament Dryer is a well-designed product that delivers reliable performance across multiple filament types. I’ve tested it with PLA, PETG, ABS, and nylon, and found that it effectively removes moisture, improving print quality and consistency. PLA and PETG dry quickly and retain their smooth extrusion properties, while ABS benefits from reduced warping, and nylon stays more stable with fewer adhesion issues. However, the built-in hygrometer isn't accurate—out of my 18 storage boxes, only a few align closely with a calibrated hygrometer, while others show large discrepancies. Despite this, the dryer itself remains dependable and efficient for filament maintenance.I have replaced all the hygrometers and am very satisfied.

he Polymaker PolyDryer has been an incredible addition to my printing setup. I used to think moisture wasn’t a huge deal—until I tried this. Instantly noticed improvements: less stringing, stronger prints, and a smoother surface finish. It’s reliable, easy to use, and the results speak for themselves.What really sold me was how well it handles hygroscopic filaments like nylon. I was able to dry my nylon down to 12% humidity, sealed it in a Polymaker container, and two months later, it’s only gone up to 13%. That level of control is seriously impressive.I was so happy with the results, I even got my workplace to switch. We’re now running 10 PolyDryers and have stocked up on over 50 Polymaker containers. If you care about quality and consistency in your prints, this is 100% worth the investment.

I have been eyeing this product and the associated dryer for sometime since seeing it on Youtube and getting a new Bambu Labs A1 printer.The concept is great, but the price really makes it impractical.I guess if you have disposable income, this would make a great system to dry, store, and use your 3D printer filament, but if you're like me, you have a LOT of filament. I can't justify $30 for every filament I have that needs to be dried and stored dry.I picked up the dryer/case and an extra case when they were on sale.The product is well made and super easy to use. It works exactly as designed. There is no way to set the actual temperature and the filament does not rotate while being heated, but I don't think either of these really detract from its usefulness. I have used it to dry PETG filament and gotten excellent prints from it.If you can stomach the price, go for it. If you catch it on a sale or the price drops, get the heater and a container or two.I built some DIY Filament Dry Boxes out of 3D printed parts and some airtight plastic cereal containers for about $7 or $8 each (including parts, filament, etc) and they keep the filament at 10% humidity. I use the dryer and then transfer the rolls to the cheap dry boxes. (rinse and repeat)Just do a Youtube search for DIY filament dry box and there are some excellent videos detailing how to make them.

I took a gamble on these after seeing some not-so-positive reviews. They are fairly expensive but evidently they've already lowered the price considerably. These are modeled after a commonly used design pattern in the 3D printing community using cereal containers. You could certainly "build your own". I think what you're buying here is convenience and the capability to use the modular drying system.After running the dryer on the "recommended" stock setting for PLA (level 6 for 6 hours) it lowered the humidity from 48% to 31%.Honestly I'm very satisfied with the purchase and like them a lot. They're easy to build and made of thick materials. I won't be using the capability to print directly from the containers since I have an AMS system, but there's an included tube to make that happen.I use Bambu filament, and they fit when not using the blue "roll holder/tube" thing. I just store that diagonally at the bottom of the container.