3D Printing Filament Dryer and Storage Box - PolyDryer and PolyDryer Box for Filament Drying and Sealing with Heat Control, Compatible with PA Nylon, PLA, PVB, PETG, ABS, TPU 1.75mm 2.85mm

I like to leave a review when one is worthy, and spoiler alert, this will be glowing. 3D printing is loads of fun with unlimited creativity, but there is knowledge that is gained along the journey. One little tidbit is that filament needs to be dried if you live in a humid area...And some, in not as humid as you would think area. After looking at the design of several devices from Creality, Anycubic, Sunlu, Comgrow and Giantarm (Filament Bags) I finally settled on the Polymaker. As I own an Ender 3 S1 Pro, I'm currently only feeding one filament at a time, so a multi-strand dryer while cool, didn't really make sense to me. I also am limited on permanent space. This lead me to the reduction of choice to single spool. I chose the Polymaker because it allows me to store the dried filament separately from the drying system (Which is partially built-in). The ability to see the humidity level in the box was a big part of my choice and know that the desiccant changes colors so you know when to recharge it. Yup, the desiccant is reusable, not just an individual pouch. And if that wasn't enough, each case comes with a good PTFE lead pipe so you can draw directly out of the case. The case itself is sealed really tight. The seals on the feet (Where you set it on the heated air flow device) also seal very well and have a rubber non-slip base as well. They stack very well too. As for the performance, well it was way better than I expected. When I received the unit, I had some prefoamed LW-PWA that had been out in the open air for weeks. When I put it in the container and let it sit for a few hours, it showed to be at 54% humidity in the container (UP from the 49 when I loaded the filament). I ran it on the forced heated air base for 6 hours as instructed. It dropped down to 41% after the first run. I decided to run it again, just for the heck of it, and it came down to 36% after the second run. After leaving it overnight it was down to 29%, just using the desiccant. Total reduction from 54-29% in less than 24 hours (About 22 hours total). I was very happy with the 25% reduction in that short period of time. Each box can be used without pulling the roll out. There are two options: 1 you can use the ball bearing rollers that are setups in the case, and they are so well designed that in an empty case, the airiflow will turn them, OR you can use the included roll post that ankers very well in the side of the box. The PTFE tubing allows for either vertical or horizontal tapping of the filament. I have minie setup to feed from behind the printer, but may make some changes in the future. Regardless, I know that the system will support whatever setup I choose. The base unit is very easy to operate, has recommendations for the filament drying temps and times listed, and allows you to set it according to that, or you can just set it for constant untimed running if you really wanted to drive it down faster. The foot print is very small as compared to the others I looked at. The power source is a bit large, but designed to not take all the slots on your power strip if using one. It will take up 3 depending on how close together they are. Overall I very much love the design of this unit, along with the well thought out engineering. The whole system seems very sturdy and strong which encourages me on its longevity. The only change I made to the setup was the desiccant color. III already had 2lb of Blue silica gel which turns to pinkish red, so i used that vs the orange that turns green. This was done for two reasons. 1. the color of the box is Blue/Black/Clear and it just looked better. 2. having the silica gel turn Pink/Red just made more sense to me with Red meaning "Stop" in my mind. Thank you for bearing with me ini what is the longest review that i have written in a long time. Should you choose to purchase this system, and it is a system, it wont let you down. Print Happy Days, and everyone will love your prinits!!

The Polymaker PolyDryer with PolyDryer Box combo works as intended. It does in fact heat up and dry out filament reasonably well, seems well made, doesn't make too much noise and is reasonably compact with a modular design. The base unit does the work, and the removable, sealable Box unit can store your dried out filament indefinitely with a hygrometer and desiccant visible with the clear box. So, what's not to like? according to The Internet, it's an overpriced, underperforming monstrosity. In my observation: The Bad: 1-The removable Box unit has a top lid with unusually difficult to operate latches. 2-The removable Box unit has two easily misplaced bottom sealing plugs that must be removed when placing the Box unit onto the PolyDryer unit. No provision is made for holding these two plugs when not in use. 3-The instruction manual is a bit sparse with no mention of actual intended temperatures, humidity or power levels. Also, worryingly, it advises to unplug the Power Supply from the wall when not in use. This seems like an unusual precaution in modern times and calls into question the quality of the Power Supply. 4-The LCD displays in both the base unit and the inboard Hygrometer are difficult to read off-axis. 5- No actual temperature displays are included, just a relative heating level selector and timer on the base unit and a Hygrometer inboard of the Box unit. The Good: 1- It works as described and expected with easy to use controls. 2- While hardly silent, the sound is reasonably unobtrusive. 3- The Box section seals really well and has an inboard Hygrometer and Desiccant container, the Desiccant itself being re-usable and replaceable. 4- It is reasonably compact and there modular Box units are sturdy and well-sealed. Neither good nor bad: The Power Supply is external, and thus replaceable. Odd that it is not built in, but whatever. Not very stylish at all. Just functional. Not especially cheap or expensive. In comparison to my first Filament Dryer unit, an eSun eBox Lite: The Polydryer works better and allows for sealed storage. So far has lasted longer as the eSun's heater failed within the first few hours of operation. The eSun is easier to open and close and looks nicer. Both have very similar controls and displays with three relative heating levels. The PolyDryer costs more but works better. The eSun manual is not quite as sparse, with actual intended temperatures, power and humidity levels published though probably wildly optimistic.

TLDR: They work great for the enclosed python ams. I run 2 in the back of each of my python units. I hate the power bricks. I’ve melted a spool on accident on the highest setting. I like the modularity. I haven’t had issues with storage in the containers. Long/in depth part: I don’t have exact measurements from a thermometer, but considering I melted one of my spools (the spool, not the filament) when having it on the highest setting to dry, and the box discolored/warped as well, I think it gets hot enough. Given the spool was very large because it was a tpu spool from geeetech so maybe that caused issues? The little blue spool holder thing didn’t even lift the spool but it fit in the box just fine so I went for it. Maybe I got units out of spec compared to everyone else? Whatever the case, they work awesome. They’re all mini dragons of filament drying goodness in my setups. I have 5 of them. 2 for each of my python ams units (in the back of the enclosure), and one freestanding for the one off spools I dry every once in a while. The freestanding one is the one that did the melty bit above. I also bought these for my python ams and have been able to sustain temps past 120°F (what my internal thermostat can measure to. I got cheap ones okay?) at the front of the unit (2 dryers in the back on full throttle), so that gets plenty hot too. With all 4 units running (my pythons are stacked right on top of one another), things can get toasty in the upper unit. Given it takes 2-3 hours to reach temp, but sustaining past that is no problem. More exotic filaments that are needing the additional heat I do in the boxes on the single. It’s just easier to keep them in the boxes as I use them. I think they work fine for what they’re advertised to do and as a modular system. Yeah it’s not like those crazy expensive 4 spool units but it’s good for the money. I always dry longer than recommended just because it takes time for the entire container to get up to temp. My only complaint is how big the power brick is. I can only use 1/2 the plugs on my extension cord and I don’t feel like doing shenanigans with replacing them with something else. The biggest mod I did was removing the sticker with the settings (it was an accident at first thanks to tape, but it looked good enough to where I decided to roll with it). That way they’re just black units at the back of my ams. The single one still has it on, and the ams ones I never run on any setting but the highest unless I see significant issues.

This unit is overpriced and has a loud raspy whining horrid fan. The fan is so loud that I can hear it from another room, so I have to close the door. The settings are also unintuitive, requiring you to know (for example) that 2 bars is for PETG. But you will learn the settings pretty quickly for your most commonly used filaments, as there are only three of them to choose from for all filaments. The build quality is good. The plastics are good quality. The modularity is innovative. Just fix that fan!

Polymaker 3D Printing Filament Dryer – Disappointing Performance The Polymaker 3D Printing Filament Dryer promises to keep filaments dry and improve print quality, but in reality, it falls short in key areas, making it a frustrating experience for serious 3D printing enthusiasts. ❌ Weak Airflow – Poor Moisture Removal One of the biggest drawbacks of this filament dryer is the barely noticeable airflow. Effective filament drying relies on good heat distribution and active air circulation, but this unit lacks a strong fan system, making moisture removal inconsistent and unreliable. ❌ Inaccurate & Weak Heating The temperature struggles to reach the desired setting, meaning filaments like ABS, Nylon, and TPU don't get properly dried. Even at its highest setting, it feels underpowered, making it ineffective for dealing with high-humidity environments. Uneven heating leads to inconsistent filament drying, which can cause stringing, warping, and adhesion issues during printing. ❌ Not Worth the Price For the cost, there are better alternatives that provide stronger heating, better airflow, and more reliable drying results. The lack of effective moisture control makes it hard to justify this unit over DIY or more capable solutions like a food dehydrator or dedicated drying box with proper airflow. ⚠️ Final Verdict: 4/10 – Underwhelming Performance The Polymaker 3D Printing Filament Dryer fails to deliver reliable airflow and heating, making it ineffective for properly drying filaments. If you're serious about reducing moisture-related print issues, you're better off looking at other filament drying solutions. ❌ Not recommended unless improvements are made to airflow and heating performance. Update : Inconsistent Quality – New Boxes Have Design/Manufacturing Flaw I already own one PolyDryer box and have been very happy with it. It keeps filament dry and allows printing directly from the box without any issues. That positive experience led me to buy a second one — and unfortunately, that’s where the problems began. In the new box, the central rod (which holds the spool in place) constantly falls out. At first, I thought the rod was faulty, but after testing multiple rods (including ones from my original box), I confirmed the real issue is with the new box itself — not the rod. The internal design or dimensions seem off, making it impossible for the rod to stay in place. This is frustrating because it renders the box almost useless for printing directly from it — one of the main selling points. It’s clear that the newer batch has some design or manufacturing defect, which is disappointing from a brand like Polymaker. Until this is addressed, I can’t recommend buying another one. Quality is clearly inconsistent between units. (Video attached for reference.)

I print mostly PLA, with very occasional Silk or Matte. (I have yet to need to print with PETG). With Silk and Matte, and especially PETG, requiring low humidity levels of 20 to 30 for perfect prints, I was looking for a way to not only dry those rolls, but then keep them dry for extended periods of time until I actually need to use them for a print job while ensuring the humidity levels remain low enough to simply take the roll out and print from my ams lite. (The box does allow to print direct from it without removing the roll, if that is your preference). This is where the Polydryer and Polydryer storage box are the perfect solutions for me. Not only does the dryer work extremely well to dry my filament rolls, but I am then able to keep them dry for months at a time versus being forced to dry for hours and immediately print. When not drying, the actual dryer has a very small footprint which is also a huge plus for me. If you don't print filaments susceptible to moisture often, this might be the perfect option for you too. 🙂👍

Great solution for drying and storing filament. This has solved my problem with PETG filament. The storage unit has two holes one on the narrow side and the other on the top for filament feed to your printer. This keeps the filament as dry as possible while printing. I bought another storage unit for my PLA. The dryer is a separate unit and can be moved from storage unit to storage unit. PETG drying takes 6 hours. The storage units have desiccant and a humidity meter. Great job PolyMaker!

The box seals well, and the bearings are pretty good, but it doesn't vent particularly well during drying, despite advertising claims. The desiccant holder was annoying to fill. The desiccant holder doesn't have very good airflow, and heating to dry out the desiccant doesn't work well. The humidity gauge could not handle the heat of drying and died. For cost, I'm surprised the dryer only gives three temperature levels and does not give a number. The beep on it is CRAZY LOUD AND ANNOYING and there is no way to turn it off. There are a lot of design oversights with this product, and I think it's not a very good value. I'm likely to return it and the extra box I purchased.