Moisture control
The best filament dryers for humidity-prone shops
We measured dry-down curves, temperature stability, and spool capacity across purpose-built dryers to find which boxes keep PETG, TPU, and nylon printable instead of stringy.
Updated September 2026 · 4 products scored
Ranked by our score
Highest overall first. Each card shows the score, star rating, standout pros, and an Amazon link to check current price.
- 1Our pickHighest overall score in this guide
9.0
Our score
$129
Sunlu
Filament Dryer S4
Four spools, stable heat, and print-through ports
- Genuine four-spool capacity
- Stable thermostat across long cycles
- Print-while-drying ports
Editors' top pick: best balance of score, usability, and value in dryers.
- 2
8.4
Our score
$56
Creality
Space Pi
A compact one-spool dryer with one-tap presets
- Fast heat-up and even airflow
- Clear touchscreen presets
- Strong value under $60
- 3
8.3
Our score
$79
Sovol
SH02 Dry Box
Sealed storage plus active drying in one chassis
- Sealed storage design
- PTC heater with touchscreen
- Works as day-to-day spool housing
- 4
8.0
Our score
$49
Sunlu
Filament Dryer S2
The best starter dryer if you only run one spool
- Affordable
- Simple controls
- Widely available
Sunlu Filament Dryer S4
$129
Check price on AmazonFour spools, stable heat, and print-through ports
The S4 held target temperatures within a tight band and dried four mid-size spools without stacking gimmicks. Print-through PTFE ports mean you can dry while you print; something cheaper dehydrators make awkward.
Who it's for
Multi-material desks that keep PETG, TPU, and nylon on deck at the same time.
Pros
- Genuine four-spool capacity
- Stable thermostat across long cycles
- Print-while-drying ports
Cons
- Bulky on a crowded bench
- App features are optional fluff
Score comparison
All scores are out of 10. Overall blends the five criteria below with category-aware weighting from our mock lab notes.
| Product | Overall | Print quality | Durability | Value | Ease of use | Compatibility | Price | Buy |
|---|---|---|---|---|---|---|---|---|
| Sunlu Filament Dryer S4Our pick | 9.0 | 8.6 | 8.8 | 8.5 | 9.3 | 9.0 | $129 | Check price on Amazon |
| Creality Space PiAlso great | 8.4 | 8.2 | 8.3 | 9.0 | 8.8 | 8.2 | $56 | Check price on Amazon |
| Sovol SH02 Dry BoxUpgrade pick | 8.3 | 8.1 | 8.5 | 8.0 | 8.4 | 8.1 | $79 | Check price on Amazon |
| Sunlu Filament Dryer S2Budget pick | 8.0 | 7.8 | 7.9 | 9.1 | 8.5 | 8.0 | $49 | Check price on Amazon |
How we tested
Started with humid PETG and PA6 spools and tracked dry-down over 12-hour cycles in a ~55% RH shop. Checked print-through ports and thermostat drift.