Quick Summary
SUNLU Official Filament Dryer S4 is a 3D printer filament dry box made for holding up to 4 spools at once. It includes a 350W PTC heater and auto humidity control, with three built-in fans and temperature balance within ±3℃.
It is aimed at users who want to store and dry multiple filament spools in one box, with settings that react to humidity levels and help maintain the stated drying range.
Who It Is Best For
This box suits buyers who use several filament spools, including multi-colour or multi-machine printing setups. It is also relevant if you want a single storage box for drying and managing filament humidity.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | SUNLU, identified in the product title as the official version. |
| Model | S4, which helps confirm the exact product variant. |
| Product type | Filament dryer box / filament dry box for 3D printer filament. |
| Capacity | Holds 4 spools at once, supporting multiple filaments in one unit. |
| Heater | 350W PTC heater for faster heating. |
| Heating result | Stated rise from 25℃ to 50℃ in 30 minutes. |
| Fans | Three built-in fans, with two on the sides and one on the bottom. |
| Temperature balance | Maintains balance inside the box within ±3℃. |
| Humidity control | Auto humidity control with mode 2 humidity range of 30% to 50%. |
| Safety features | PTC, temperature switch and software protection are stated for temperature monitoring. |
| Colour | White. |
Why Buyers Choose It
- 4-spool capacity means several filament reels can be managed in one box.
- The stated 350W PTC heater is paired with a 30-minute heat-up figure from 25℃ to 50℃.
- Three built-in fans are stated to help keep temperature balance within ±3℃.
- Auto humidity control in mode 2 gives a defined humidity range of 30% to 50%.
What To Know Before You Buy
Check that your filament spools suit a 4-spool box before ordering. The internal control range is tied to mode 2 humidity settings, so confirm that this matches how you want to manage storage and drying. The unit is described as a filament dry box rather than a printer, so it is for filament storage and drying rather than printing itself.
Common Buyer Questions
How many spools does it hold?
It holds 4 spools at once.
Does it have automatic humidity control?
Yes. Auto humidity control is stated, with mode 2 covering 30% to 50% humidity.
What heater is fitted?
It uses a 350W PTC heater.
What colour is it?
It is white.
Final Buying View
If you need a filament dry box for multiple spools, the SUNLU S4 gives a clear 4-spool format with stated humidity control, heating and fan support. Check the spool count and humidity mode against your setup before ordering.
