EIBOS Polyphemus Filament Dryer Review: Get Your Filament Dry!

3D printing is amazing until your filament starts popping, stringing, and ruining your prints. The solution? Dry your filament properly. And if you want to do it right, the EIBOS Polyphemus might be the dryer your looking for.

Why Drying Filament Matters

Most 3D printing filaments are hygroscopic, which means they absorb moisture from the air. Moisture is the hidden enemy of great 3D prints. Whether you’re printing with PLA, ABS, PETG, or TPU, wet filament leads to:

  • Stringing
  • Popping sounds
  • Weak layers
  • Brittle prints
  • Poor surface finish

The EIBOS Polyphemus helps eliminate those issues by drying your filament evenly and reliably while rotating your spools to prevent moisture buildup in specific spots

Key Features

  • Max Temp up-to 70C
  • 12 Material Presets – No guesswork, just set and go
  • Drying Time Adjustable from 30min to 24hrs or Continuous mode
  • Spool Capacity Dual 1kg or 3kg (with the base expansion)
  • Filament 360 Rotation – Ensures uniform drying ( On or Off modes)
  • LCD Display – Real Time Temperature and Humidity Tracking
  • Built in Desiccant Slots
  • Power Supply Built in – Clean setup, no bulky bricks
  • Spare parts – Spare motor and O-rings.

Unboxing and Assembly

All items arrive securely packaged, with protective film on the acrylic panels and generous foam padding. Assembly is quick and easy, taking less than 5 minutes to put together. We just connect the plastic frame, insert the panels and handle and tighten a few screws. Once assembled and loaded, it’s ready to use!

There is also an optional Expansion Part that connects to the bottom of the lid. This raises the internal height by about 4.5cm allowing enough room to use a larger 3kg spool of filament.

Spool Rotation

Unlike standard dryers, the Polyphemus actively rotates your filament during the drying process. This guarantees uniform moisture removal and eliminates any potential bad spots on the spool. It turns the spool every few seconds with a cam and then reverses after a full revolution. Although make sure that the filament end is tucked in other wise it will get caught and stop rotating, as I found out. And its good to know the 360 mode can be turned on or off in the via the dedicated 360 button found on the front.

Cam roller with O-rings used to turn the filament spools

Optional Expansion Part installed allows for single 3kg spools

Now there is also a spare roller that can be swapped out on one side which allows one side rotation while you can print from the other side. Eibos also states that the motor for the 360 rotating function has a life span of 1500hr and have included a spare motor that can be easily swapped out from the underside if needed. They also include two spare O-rings that are used on the cam gears for turning the roll of filament.

User experience

The build quality feels solid, and the transparent panels make it easy to keep an eye on the spools. Controls are straightforward with convenient front facing buttons, and the clear LCD displays all the settings, along with real-time temperature and humidity readings.

The 12 preset modes are a great feature, making it simple to set it up and let it run without much fuss. There are eight filament outlets positioned around the dryer, three in the front, two at the back, and three on top, offering plenty of flexibility to suit different printer setups.

The 360-degree rotation function is a useful addition for evenly drying the spools. By continuously rotating the spools during operation, it promotes consistent and even heat distribution, which can help reduce moisture-related printing issues and improve overall filament performance.

While it takes a bit longer to heat up compared to some other dryers I’ve used, it works well once it reaches the target temperature. The bottom of the dryer does get noticeably warm to the touch, so be sure to place it on a sturdy, heat-resistant surface. The lid is easy to remove, giving you good access for loading or swapping out filament. I also appreciate the adjustable vent on top, which helps release moisture effectively.

Price and Comparable Models

Priced at $143.00 (April 2025) , the EIBOS Polyphemus (not including the expansion base for 3kg spools) is a more expensive than the similarly sized Creality Space Pi Filament Dryer Plus, which comes in at $89, making it a little tough to justify the higher cost. And at around $149 you can get the SunLu S4 that can dry 4 rolls of filament. My go-to filament dryer that I use still is the Creality Pi single spool model at $69 (check out the review here).

Final Thoughts

Is a filament dryer worth it? Absolutely! If you’re consistently chasing high-quality prints, a filament dryer is a game-changer. Whether you’re dealing with stringy PETG, popping PLA, or brittle nylon, it tackles moisture issues across the board. While it might seem like a luxury at first glance, after just a few uses, it quickly earns its place as an essential part of your 3D printing setup.

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