[Upgraded with Fan] 2024 SUNLU Official Filament Dryer Box S2 for 3D Printer Filament, Upgrade Filament Storage Dehydrator for PLA PETG ABS Nylon PA Filament 1.75 2.85 3.00mm

The filament dryer is compact and a nice clean little setup. The display is bright and easy to read, and it generally seems to work well. There is a fistful of dessicant packs inside the dryer, and I wasn't sure if it was just for packing or if they are to help with storing filament in the dryer. Turns out it is the latter. The packs eventually soak up water and can be "recharged" by baking them to have them release the moisture.Originally I tried drying out a roll of PETG that had been sitting out for a couple of weeks, and I decided to add the dessicant packs into the dryer (it was drying at 50c, which is still safe for the paper packs). The first thing I noticed is that there isn't a built in cutoff for turning off the dryer if you open the lid. The inside doesn't get dangerously hot, so it wasn't a big deal. What surprised me is that once I put in the dessicant packs, the relative humidity went from 78% up into the 90-something percent. So it seems that those packs had absorbed a bunch of water and were releasing it again once heated. It took probably 5-6 hours before the packs seemed to have dried out and the relative humidity in the dryer went back down to 73% (the ambient humidity at the time). So, the quick lesson is, dry out those dessicant packs before you try to dry any filament - otherwise they'll just release moisture into the dryer while you're trying to dry out your filament!The instructions that come with the unit were pretty minimal, the online instructions were better but the controls for turning on the LED light ring are blended in with the controls for turning the drying function on and off. I was expecting to find a seperate button or screen control for turn the drying function on and off, but you have to use the LED (on/off) settings to turn the dryer on and off. You also need to press the power "on/off" button twice to turn on the power for the dryer, which is kind of weird and non-intuitive.Overall, I think this filament dryer is a winner, and aside from the caveats about drying out the dessicant packages before drying your filament, and some non-intuitive design choices in the UI, its a good investment for 3D printer owners. Way better than baking your filament in the oven!

I purchased the Sunlu FilaDryer S2 to work with my Creality K1 3D printer. Filament that has absorbed moisture from the air can cause a number of different problems while 3D printing and this dryer helps to avoid those problems.The unit has a clean and simple design. The lid opens easily and the display has large, backlit characters that are easy to read. Inside, it has both top and bottom heating elements to uniformly heat the filament and reduce its moisture content. The unit has two rollers for the spool of filament to set on and allow the filament spool to easily rotate if you choose to feed directly from the filament dryer to your 3D printer. Other reviewers have commented that the dryer is noisy - but I have not noticed that issue. I used the dryer on a roll of Hyper PLA filament that came with my K1 printer. It started out at 40% relative humidity that was reduced to 23% within two hours.There are some areas for possible improvement. Documentation is poor - both in what is supplied with the dryer and even more lacking on the Sunlu website. For example, some of the symbols on the display and the use of the silica packets supplied with the dryer are not described at all. A few more openings for direct feed to 3D printers would be helpful to reduce sharp turns for the filament. On my dryer, the ON/OFF button is somewhat stubborn requiring multiple button presses to activate.Overall - I'm happy with the dryer and feel it is a solid product at a reasonable price.

First impression here. Will update if anything significant presents itself with more use.Overall solid functioning dryer with some serious cost cutting measures that limit the overall quality.Be aware, you MUST run this with dessicant packs inside to dry out the filament. The unit itself will only warm the filament and the air, which will help the filament shed moisture into the air, but unless there is dessicant in there to absorb that moisture, it will just wind up back in your filament.PROS:In 8 hours, it dropped the humidity in the chamber from 60% to around 35%. [UPDATE: turns out it only performs this well with high quality freshly dried dessicant - the packs it shipped with were worthless and actually RAISED the humidity from 40% to 52% when I tested them, meaning they were not packed dry - if you must use them, bake them first for an hour or two at 150F/100C to dry them out].It has top and bottom heating coils for "360" (or nearly 360) heating - close enough to achieve consistent temperature throughout the chamber.The cassette your filament is stored on sits on rollers that turn very freely, so it can turn very easily if you choose to feed from this dryer directly into your printer.It includes a 1 meter teflon tube to run the filament from the dryer to your printer for properly aligned feed into the extruder while minimizing time the filament spends exposed to higher humidity before printing.The user interface is simple, effective, and easy to read.The fan is SUPER quiet - I had to press my ear to the side of the dryer to confirm there even is a fan going... may seem like its underpowered, but remember, it's not trying to vent moisture - that would only allow in fresh moist air. it is circulating air to make the drying more efficient.CONS:The lid hinge is cheap and loose.The legs barely provide adequate stability - any bump is going to knock this thing overThere are (only) 2 holes for feeding out the filament, and they are NOT angled to allow for straight line feed off the cassette - your filament will take a somewhat sharp turn to exit out the teflon tube. I recommend feeding the teflon tube far enough into the dyer that it help prevent kinking by smooting out that turn - at least a 3-5 inches (10-15 cm).The feed holes have little gaskets for the teflon tube to mount into. These gaskets are TINY, clear, and prone to falling out when trying to insert the teflon tube because they are just a bit too small for easy insertion, but also just a bit too small to seat firmly in the lid. Clearly Sunlu knows this is an issue because they provide FOUR (!!!) spare gaskets - but ZERO plugs to plug up the unused hole.1 meter of teflon routing tube is almost useless. It would be better to have included 2 meters - even sitting right next my (large) printer, 1 meter will not reach from the dryer on the table to the runout sensor at the top of the gantry without kinking the filament.Lastly, there is no gasket where the lid meets the body of the unit. Hard to imagine this is not allowing outside moisture in, so storing filament in here between prints is probably not a great idea without making sure the dessicant is freshly dried.Overall:For the price, it is a good unit, looks nice, and does the job well. For the 3rd gen, I hope Sunlu changes the angle of the feed holes, adds one or two more feed holes, provides plugs for the unused feed holes, sources a more solid hinge for the lid, and adds a gasket to seal the lid properly when closed. That would make this good dryer into a GREAT dryer.