SUNLU FilaDryer S2 vs EIBOS Filament Dryer: Which to Buy?

Both dry filament well. The SUNLU FilaDryer S2 is the cheapest way to find out whether moisture is hurting your prints, ideal for one spool at a time. The EIBOS adds a live humidity display so you dry by data instead of a timer, which matters most for nylon and engineering materials where incomplete drying causes failures.

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At a glance

Spec	SUNLU FilaDryer S2 Check price on Amazon	EIBOS Filament Dryer Box Check price on Amazon
Price	$38 to $52	$45 to $65
Our rating	4.5 / 5	4.5 / 5
Best for	First-time filament dryer buyers and printers who work with one material type at a time and want to verify whether drying improves their print quality before investing in a larger unit.	Printers who want data-confirmed drying rather than time estimates, particularly useful for nylon and engineering materials where incomplete drying produces immediate and costly print failures.
Humidity readout	No, time-based	Yes, live display
Capacity	One spool	One spool
Best use	First diagnosis, single material	Verified drying, engineering materials

The two options in depth

REF Amazon

SCORE 4.5 / 5.0

SUNLU FilaDryer S2

The SUNLU S2 is the most widely recommended entry-level filament dryer in the hobby. It accepts one spool, heats to between 35 and 70 degrees Celsius, and can run continuously during printing to prevent moisture re-absorption. The S2's temperature range covers PLA (45 to 55 degrees), PETG and TPU (60 to 65 degrees), and ABS and ASA (65 to 70 degrees). At under $50, it is the most accessible path to moisture-free printing.

BEST FOR: First-time filament dryer buyers and printers who work with one material type at a time and want to verify whether drying improves their print quality before investing in a larger unit.
PRICE: $38 to $52

135 to 70 degree Celsius range covers PLA, PETG, TPU, ABS, and ASA drying requirements
2Can run during printing to keep filament dry as it feeds, not just as a pre-print treatment
3Budget price makes a dryer accessible for users who do not want to spend significantly before seeing results

Single-spool capacity requires multiple units or multiple drying sessions for users with diverse material queues

SOURCE Check price on Amazon

REF Amazon

SCORE 4.5 / 5.0

EIBOS Filament Dryer Box

EIBOS positions itself above the SUNLU S2 with a brushless motor internal circulation fan, precise PTC heating element, and a humidity display showing real-time moisture level inside the chamber. The humidity readout is the differentiating feature, it tells you when the spool is actually dry rather than requiring you to guess based on elapsed time at temperature.

BEST FOR: Printers who want data-confirmed drying rather than time estimates, particularly useful for nylon and engineering materials where incomplete drying produces immediate and costly print failures.
PRICE: $45 to $65

1Live humidity display shows actual chamber moisture, eliminating guesswork about drying completion
2Brushless circulation fan distributes heat more evenly than convection-only designs
3Supports printing directly from the dryer chamber with a filament guide port

Single-spool capacity like the S2; requires multiple units for multi-material workflows

SOURCE Check price on Amazon

Which should you buy?

Buy the SUNLU S2 first if you are not yet sure moisture is your problem; the cost of a diagnosis is low. Step up to the EIBOS if you print nylon, PA-CF, or other engineering materials where you need to confirm the chamber is actually dry rather than guess from elapsed time. The humidity display is the difference between the two.

Common questions

Do I need a humidity display on a filament dryer?

Not for casual PLA and PETG drying, where a timer is fine. It becomes valuable for nylon and carbon-fiber blends, where incomplete drying produces immediate failures and you want confirmation the chamber reached a stable low humidity.

Can either dry filament while printing?

Yes, both can feed filament out to the printer during use, which prevents hygroscopic materials from re-absorbing moisture on long jobs. Thread the filament through the guide port and run the dryer continuously.

Is the EIBOS worth the extra cost over the SUNLU S2?

If you print engineering materials or want to stop guessing about dryness, yes. If you mostly print PLA and PETG and want the lowest-cost entry, the SUNLU S2 is enough.