Filament Storage Box 4-Pack with Hygrometers vs SUNLU S2 Single-Spool Filament Dryer
Head-to-head spec comparison to help you pick the right environment upgrade for your needs.
Generic
$38
SUNLU
$79
Spec-by-Spec Comparison
| Spec | Filament Storage Box 4-Pack with Hygrometers | SUNLU S2 Single-Spool Filament Dryer |
|---|---|---|
| Category | Dry storage | Filament dryer |
| Role | Bulk sealed storage | Single-spool diagnostic dryer |
| Max Temp | 0 C | 70 C |
| Capacity | 4 spools | 1 spool |
| 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, PLA+ |
| Footprint | Shelf boxes | Compact bench box |
| Price | $38 | $79 |
| Rating | 8.1/10 | 8.6/10 |
| 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 S2 Single-Spool Filament Dryer
Pros
- Single-spool format is the right size for diagnosing whether wet filament is actually the cause of stringing, popping, and dull surfaces.
- Active heat and a compact footprint make it easier to leave on the bench than a food-dehydrator workaround.
- Print-through path supports long PETG or TPU prints without moving the spool back into room air.
- Good middle ground for users who need real drying but do not yet need a four-spool station.
Cons
- One spool at a time becomes frustrating once you rotate several colors or materials every week.
- You still need dry storage boxes for partial rolls after the drying cycle.
- No single dryer can fix under-extrusion, retraction, or temperature mistakes that only look like moisture.
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 S2 Single-Spool Filament Dryer
The SUNLU S2 is the most practical first filament dryer for a small Print Climate bench. It gives you a repeatable moisture-control step without forcing a huge workstation change, and it pairs naturally with sealed dry boxes once you have more than two active rolls.
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