Ceiling is not uniformity
Reaching a displayed maximum does not prove that a loaded spool is heated evenly throughout the chamber.
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Is this the right dryer for you?
SUNLU FilaDryer S4 Pro
Four-spool system with two independently controlled chambers, a documented 45–85°C range, target-humidity automation, and drying/annealing modes.
Choose this if: You need two drying temperatures at once and prefer target-humidity controls.
Two independent chambers let you group four spools into two approved cycles within 45–85°C. The practical gain over the standard S4 is separate temperature control and a higher ceiling—not extra spool capacity.
4 spoolsfeed-through documentedindependent zones
Temperature-ceiling screen
Family references this model can reach on paper
The spool also has a limit
Do not expose a spool to more heat than its maker permits. Respooling may be required for higher-temperature drying.
Exact product data wins
Formulation-specific instructions override this family-level screen. Confirm the exact model and current regional product specification.