Sunlu i10 Filament Dryer Review: $180, Ten Spools, and PETG That Actually Stops Stringing

Moisture is the enemy of consistent FDM printing, and it shows up in specific, predictable ways: PETG strings excessively, PLA becomes brittle and snaps mid-print, PA and TPU absorb humidity fast enough that a spool left open overnight can produce noticeably worse results than a fresh-opened one. Filament dryers solve this, but the market has a wide range of quality — from cheap dehydrators repurposed from food applications to dedicated drying cabinets designed to keep filament in stable storage conditions rather than just heating it.

The Sunlu i10 is in the dedicated cabinet category. After months of testing, it earns its position.

What the i10 Is

Cabinet dimensions: 395mm × 300mm × 508mm. Capacity: ten regular-sized spools. The form factor is a vertical storage cabinet with a humidity display — you can see ambient humidity inside the cabinet and whether drying is actively reducing it, rather than just hoping heat is doing something useful.

The design philosophy differs from basic heated dehydrators in one specific way: the i10 maintains filament in a stable dry state rather than continuously heating it. Active heating when the cabinet runs is supplemented by a desiccant or sealed environment that preserves the dried state. The practical effect is lower per-hour power consumption and less thermal cycling of your filament — relevant for materials that can degrade with repeated heat exposure.

Performance Testing

The reviewer tested across four material families:

PETG: The most notable improvement in the test. PETG stringing — fine hair-like threads between features that don’t touch — reduced significantly after drying. PETG is hygroscopic enough that a spool left on a printer for 24 hours accumulates enough moisture to print noticeably worse than a freshly opened one.

PLA: Brittleness reduction observed. PLA that’s been exposed to humidity long enough becomes fragile — snapping during feeding rather than flexing. The i10 reversed this in tested samples.

TPU and PA: Tested from multiple brands (Polymaker, Prusa Research, Bambu Lab, 3D4Makers). Both materials benefit substantially from pre-print drying. TPU and PA absorb moisture faster than PLA/PETG and are more sensitive to print quality degradation from it.

Price and Value Comparison

At approximately $180, the i10 sits above the budget dehydrator tier ($30–60, repurposed food appliance) and below the high-end drying solutions ($250+). The ten-spool capacity at this price point is the core value argument: most competing cabinets at comparable prices hold four to six spools.

The relevant comparison for serious 3D printing setups isn’t “is this better than a food dehydrator” — it’s “is a ten-spool capacity dedicated cabinet worth $180 versus running multiple smaller units.” For anyone printing across multiple material types regularly, the answer is almost certainly yes.

Who the i10 Makes Sense For

Multi-material printers. If you’re running a Bambu H2D, P1S, or any multi-material setup where you’re working through multiple spool types, ten-spool capacity means one cabinet covers your entire active inventory.

PETG users. PETG is the biggest beneficiary of proper drying, and the result in the test — significant stringing reduction — is the most practically valuable outcome for print quality.

Anyone with a long-term filament inventory. Spools stored at room humidity for months degrade measurably. A storage cabinet that maintains low humidity extends the effective life of your filament inventory.

TPU/PA users. These materials absorb moisture fast enough that drying before every print run is standard advice. A cabinet that stores them dry eliminates that step.

Source: 3DPrint.com

Content created with AI assistance and reviewed for accuracy.