SUNLU FilaDryer SP2 Review: Which Set Actually Dries Filament?

Moisture is a common cause of stringing and rough prints, so a dryer is a sensible add-on once you own several spools. The SUNLU FilaDryer SP2 takes an unusual approach: the heater is a separate base, and the filament sits in a sealed box you can lift off and store.

We have not bench-tested this product. This review is based on the manufacturer's published specifications and listing, checked on November 2, 2026. Prices and stock can change, so confirm both at checkout.

The verdict

The SP2 makes the most sense if you want drying and sealed storage from one system. The full set with the heating base is the one to buy first. Extra boxes are only worth adding once you know you want more sealed storage.

Check which set you are buying

SUNLU sells two similar listings, and the difference matters:

• FilaDryer SP2 with heating base: listed at $69.99 for US shipping, against a $109.99 compare price. This is the set that dries filament.
• SP2 storage box set, no heating base: listed at $49.99 for US shipping, against a $79.99 compare price. It includes a storage box and two 1 kg spools of PLA+ 2.0 Black, but no heater.

The second set can still be good value if you already own the base or need filament anyway. It will not dry anything on its own.

Key specifications

• Heating: 200W PTC heater with a fan
• Safety: a secondary temperature protection switch and software temperature control
• Spool weight: 0.25 to 3 kg, including two 1 kg spools or one 3 kg spool
• Spool size: up to 250 mm in diameter and 153 mm wide
• Filament: 1.75 mm and 2.85 mm
• Storage: silicone seals, a built-in hygrometer, and 3 cable outlet holes on each side
• Stacking: up to 3 boxes recommended

SUNLU says a closed box held about 25% humidity inside when the room averaged about 50%. That is the maker's own figure, so treat it as a best case.

Who should skip it

If you only print a spool now and then, and finish it quickly, a basic dryer or a sealed bag with desiccant may be enough. The SP2's main advantage is moving from drying to storage without changing containers, which matters less with a small collection.

What it costs with a code

Code ZKYKDXVAI7 is listed for 5% off, which would bring the $69.99 set to about $66.49 if it applies to that item. SUNLU advertises free shipping on orders over $40, though terms can vary by region.

For the wider catalog, read our SUNLU store review or see all SUNLU offers.