SUNLU S4 Pro Dual-Zone 3D Printer Filament Dryer, 4-Spool, 380W, 85°C
SUNLU S4 Pro Dual-Zone 3D Printer Filament Dryer, 4-Spool, 380W, 85°C
- 101-91F-S4P-A
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Independent Dual-Zone Design
An insulated partition separates the left and right chambers to reduce thermal interference; control both zones from one touchscreen while assigning separate settings to each side for a more flexible multi-material workflow
Independent 45-85°C Temperature Control
A dual-channel heating system lets each chamber operate independently of 45-85°C, allowing you to dry different filament types at the same time without applying the same temperature setting to every spool
Professional Annealing Mode
M02 maintains a controlled 70-85°C chamber environment for compatible functional prints that require 2–3 hours of post-print annealing, expanding the S4 Pro from routine filament drying to advanced maker workflows
Smart Humidity Control
In M03 mode, select an RH activation threshold from 30-50%; the dryer automatically starts when chamber humidity reaches the selected level and stops heating when humidity falls to 25%, helping protect stored filament from absorbing moisture again
Four-Spool Capacity with 380W PTC Heating
Holds up to four 1 kg spools, with capacity for 2 kg on each side; supports 1.75, 2.85, and 3.00 mm filament, including PLA, PLA Plus, PLA Meta, PETG, ABS, TPU, PA, PC, and Nylon, while the 380W PTC heater delivers efficient, controlled heating
Dual-Zone Intelligence for Drying, Annealing, and Humidity Control
Moisture-sensitive filament can cause stringing, bubbles, rough surfaces, and inconsistent extrusion. The SUNLU S4 Pro is designed to prepare and manage multiple materials with two thermally separated chambers and independent 45-85°C temperature control. An insulated center partition reduces interference between the left and right zones, allowing different filament types to run under separate drying settings simultaneously.
Three operating modes support everyday printing and more advanced maker workflows. M01 provides timed drying for routine filament preparation. M02 maintains a controlled environment of 70-85°C for compatible functional prints that require post-print annealing. M03 provides automatic humidity management: set an activation threshold between 30% and 50% RH, and the dryer starts heating when chamber humidity reaches the selected level, then stops when humidity falls to 25%.
The S4 Pro holds up to four 1 kg spools, with space for 2 kg of filament on each side. It supports 1.75, 2.85, and 3.00 mm filament and works with a broad range of materials, including PLA, PLA Plus, PLA Meta, PETG, ABS, TPU, PA, PC, and Nylon. Filament can remain in the dryer during printing, helping reduce moisture exposure throughout longer jobs.
A 380W PTC heater balances heating efficiency with controlled operation, while the touchscreen provides centralized control of both chambers. Designed for multi-material printing, prototyping, print farms, classrooms, and maker workshops, the S4 Pro helps keep more filament prepared and ready for the next project.
For drying and annealing, always follow the filament or printed-material manufacturer's recommended temperature and duration. Confirm that the spool, printed part, and any installed components can safely withstand the selected chamber temperature.
FAQs
1. How can I tell if my filament needs drying?
Common signs of moisture include popping or crackling sounds, excessive stringing, bubbles, rough surfaces, and inconsistent extrusion. Drying the filament before and during printing can help reduce moisture-related print issues, although results may also depend on printer settings and filament condition.
2. What makes the S4 Pro different from a single-chamber filament dryer?
The S4 Pro has two thermally separated chambers with independent 45-85°C temperature control. You can dry different materials at different temperatures simultaneously without applying one setting to every spool.
3. How many filament spools can it hold?
The S4 Pro holds up to four 1 kg spools, with capacity for two spools or 2 kg of filament on each side. It supports 1.75, 2.85, and 3.00 mm filaments.
4. Can I print directly from the dryer?
Yes. The feed-through ports allow filament to remain inside the chamber while being supplied to your printer. This helps limit moisture exposure during long prints and multi-printer workflows.
5. Which filament materials are supported?
The S4 Pro supports commonly used and moisture-sensitive materials, including PLA, PLA Plus, PLA Meta, PETG, ABS, TPU, PA, PC, and Nylon. Always follow the filament manufacturer's recommended drying temperature and duration.
6. What are the three operating modes?
M01 Timed Drying: Runs a standard drying cycle for the selected duration
M02 Annealing: Provides a controlled 70-85°C environment for compatible printed parts
M03 Humidity Control: Monitors chamber humidity and automatically activates heating when needed
7. How does Smart Humidity Control work?
In M03 mode, you can set an activation threshold between 30% and 50% RH. When chamber humidity reaches the selected level, heating starts automatically and stops when humidity falls to 25%, helping protect stored filament from absorbing moisture again.
8. Can the S4 Pro anneal finished 3D prints?
M02 mode provides a controlled 70-85°C chamber environment for compatible functional prints that require approximately 2-3 hours of annealing. Because annealing requirements vary by material and model geometry, always follow the material manufacturer's recommendations and verify that the printed part can withstand the selected temperature.