Filament Storage Box 4-Pack with Hygrometers vs SUNLU S4 Four-Spool Filament Dryer
Head-to-head spec comparison to help you pick the right environment upgrade for your needs.
Generic
$38
SUNLU
$169
Spec-by-Spec Comparison
| Spec | Filament Storage Box 4-Pack with Hygrometers | SUNLU S4 Four-Spool Filament Dryer |
|---|---|---|
| Category | Dry storage | Filament dryer |
| Role | Bulk sealed storage | Multi-spool drying station |
| Max Temp | 0 C | 70 C |
| Capacity | 4 spools | 4 spools |
| Active Heat | No | Yes |
| Active Airflow | No | Yes |
| Humidity Readout | Yes | Yes |
| Print Through | No | Yes |
| Ventilation | No | No |
| Resin Workflow | No | No |
| Abrasive Ready | No | No |
| Best Materials | Stored PLA, PETG, TPU | PETG, TPU, nylon, PLA+ |
| Footprint | Shelf boxes | Large bench station |
| Price | $38 | $169 |
| Rating | 8.1/10 | 9.1/10 |
| Buy on Amazon | Buy on Amazon |
Pros & Cons
Filament Storage Box 4-Pack with Hygrometers
Pros
- Best cost-per-spool option for organizing partial rolls, backup colors, and seasonal materials.
- Hygrometers turn dry storage from a guess into a visible maintenance loop.
- Useful even after buying a premium dryer because active drying without sealed storage wastes the cycle.
- Low-risk budget pick for garages and basements where ambient humidity shifts week to week.
Cons
- No active heat: this prevents re-wetting but does not rescue already wet filament.
- Generic boxes need inspection for gasket quality and lid fit before trusting expensive nylon or PA-CF.
- Can create a false sense of security if the desiccant is not recharged or replaced.
SUNLU S4 Four-Spool Filament Dryer
Pros
- Four-spool capacity makes it the cleanest single purchase for AMS-style benches, color swaps, and households with several open rolls.
- Active heat plus circulation solves the two-part drying problem: warming the spool and moving humid air away from the filament surface.
- Print-through workflow reduces the chance that a dried nylon, TPU, or PETG spool immediately reabsorbs moisture while a long job runs.
- The higher price is easier to justify when you would otherwise buy two single-spool dryers plus separate dry boxes.
Cons
- Overkill for a one-printer PLA bench where a sealed storage box and occasional single-spool dryer would do the job.
- Large footprint demands a real bench position, not a corner shelf.
- Multi-spool dryers do not replace labeled dry storage; partial rolls still need sealed long-term storage after the print.
Our Verdicts
Filament Storage Box 4-Pack with Hygrometers
A four-pack of hygrometer dry boxes is the least glamorous product on the list and one of the highest-leverage fixes. If you own several partial PETG or PLA+ rolls and keep finding them exposed on a shelf, buy storage before chasing another slicer profile.
SUNLU S4 Four-Spool Filament Dryer
The SUNLU S4 is the best launch pick for a printer owner who has moved past one open PLA roll and now needs an actual humidity-control station. It is not the cheapest way to dry a spool, but it is the most coherent way to keep several filaments usable, print from the box, and stop treating wet PETG or nylon as a printer-tuning mystery.