SUNLU S4 Filament Dryer Box for 3D Printing, Temperature Balanced Drying

The SUNLU S4 Dryer Box for 3D Printing delivers temperature-balanced drying to improve filament quality, reduce moisture-related print issues, and extend the life of your 3D printing consumables. With ship-from-Amazon FBA reliability, it combines a large internal capacity with fast heating to keep your multi-color and multi-printer setups running smoothly. The internal 450 × 210 × 211 mm space can dry four rolls of 1 kg consumables at the same time, making it ideal for labs, makerspaces, and busy home setups.

Powered by a 350W PTC heater, the S4 heats to 50°C in about 30 minutes, ensuring your filaments reach the right dryness quickly and consistently. It features three levels of safety protection—PTC thermistor, temperature switch, and software triple protection—plus real-time temperature monitoring and alarms for abnormal conditions, so you can dry with peace of mind. The cooling and drying process is finely controlled by left and right side circulating fans and a bottom heating fan, delivering a balanced chamber temperature within ±3°C. This balance ensures every part of the spool dries evenly, reducing moisture pockets that can cause jams or poor extrusion.

The S4 also offers adjustable humidity to meet different filament needs. Set the chamber humidity between 30% and 50%; the system will automatically run until the humidity drops to 25% and then stop, helping you tailor drying to specialty materials. It’s compatible with all printer models and supports up to four printers at the same time, handling filaments with diameters of 1.75 mm, 2.85 mm, and 3.0 mm with ease.

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

Reminder: Starting from July 2025, the S4 support frame will be changed to the following picture style.

Benefits & Tips

• Dry filament before printing to reduce moisture-related defects such as popping, stringing, and inconsistent extrusion.
• Prepare multiple spools for multi-color or multi-printer setups; the S4’s large capacity supports efficient workflows in shared labs or classrooms.
• Use the adjustable humidity feature to tailor drying for different materials (PLA, PETG, nylon, etc.) and ensure optimal print consistency across batches.

Product specifications

• Brand: SUNLU
• Model: S4 Dryer Box
• Origin: Mainland China
• Internal size: 450 × 210 × 211 mm
• Drying capacity: up to 4 rolls of 1 kg consumables simultaneously
• heater: 350W PTC heater
• Heating speed: reaches 50°C in ~30 minutes
• Safety: PTC thermistor, temperature switch, software triple protection with real-time temperature monitoring and alarms
• Temperature balance: ±3°C across the chamber due to left/right fans and bottom heating
• Humidity control: adjustable 30%–50%, automatic operation until humidity reaches 25%
• Airflow: left/right circulating fans and bottom heating fan
• Compatibility: supports all printer models; up to 4 printers simultaneously; suitable for filaments from 1.75 mm, 2.85 mm, 3.0 mm
• Shipping origin: Ship From Amazon FBA Warehouse

Package includes:

• Details not specified

Warnings / Reminders

Note: Starting from July 2025, the S4 support frame will be changed to the following picture style.

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