Best Heated Filament Dryer Box for Dry Filaments
Answering the search intent: A heated filament dryer box provides moisture control and consistent drying for 3D printer filaments, helping reduce stringing, poor adhesion, and clogs. The top picks here are best for makers who print with PLA, PETG, ABS, or flexible filaments and want reliable drying before or during printing. This guide compares five well-rounded options to fit different workflow needs—from compact two-spool boxes to all-in-one storage-and-dryer solutions.
| Product | Best For | Key Benefit | Drying Capabilities |
|---|---|---|---|
| Comgrow Filament Dryer Box, SH02 | Two-printer households | Fast 150W PTC heating with 360° airflow | 9 filament types with presets |
| SUNLU SP2 Filament Dryer & Storage Box | All-in-one storage plus drying | Detachable dry box with 70°C max | Two 1kg rolls, 6 silicone holes |
| SUNLU S2 Filament Dryer Box | Budget-conscious drying | Built-in circulation, LCD readouts | Moisture control for common filaments |
| Comgrow 3D Printer Filament Dryer Box | Drying and immediate use | Large inner volume, two-spool capacity | 1.75/2.85mm compatibility |
| Polymaker PolyDryer | Modular, expandable setup | Two-unit system with dry dock and box | PA, Nylon, PLA, PETG, ABS, TPU support |
Comgrow Filament Dryer Box SH02
The SH02 box features two spool holes and supports two 1 kg filaments simultaneously. It uses a 150W PTC heater to reach up to 70°C with a 360° circulating fan. A 9-type filament preset simplifies operation by selecting the material type. Best for users who print with multiple filaments or run two printers in parallel. Limitation: while preset temps cover common filaments, unusual blends may require manual adjustments.
SUNLU SP2 Filament Dryer & Storage Box
The SP2 is an all-in-one drying and storage solution with a detachable base. It dries filaments up to 70°C quickly using a 250W heater and 360° heating. Its storage base accommodates two 1kg spools, and six silicone holes plus PTFE tubes support flexible material handling. Choose this if you want a compact unit that doubles as a dry storage box. Caution: integration of drying and storage means you should monitor humidity if you switch materials often.
SUNLU S2 Filament Dryer Box
Product notes emphasize transparency about inventory and the moisture risk in humid environments. The S2 positions itself as a practical option for improving print results by removing moisture prior to or during printing. Best for users who want a straightforward, humidity-aware drying solution. Limitation: official product notices should be checked for stock or shipment details before purchase.
Comgrow 3D Printer Filament Dryer Box
Designed for two 1kg spools and standard 1.75/2.85mm diameters, this box emphasizes a large storage volume and moisture removal during drying. Best for multi-spool setups where stable, pre-dried filament is needed for uninterrupted prints. Caution: the device requires follow-on steps to ensure long-term storage in a vacuum after drying to maximize moisture resistance.
Polymaker PolyDryer and PolyDryer Box
PolyDryer offers a modular two-unit approach: a Dry Dock for steady heating and a PolyDryer Box for sealing and protection. It is designed to support various materials including PA Nylon, PLA, PETG, ABS, TPU. Best for users who want an expandable system that can grow with their filament collection. Limitation: modular setups may require additional space and planning for future expansion.
Buying Guide
What to consider when choosing a heated filament dryer box:
- Filament capacity: Do you need to dry two spools at once or more? Look for boxes that match your spool size and volume.
- Drying temperature and speed: Higher max temperatures and faster warm-up can reduce moisture more quickly but may affect sensitive materials. Check the temperature range and heating element wattage.
- Uniform heating: A 360° airflow or built-in fan helps ensure even drying across the spool. This reduces localized overheating and uneven moisture removal.
- Material presets: Some models offer one-key presets for common filaments (PLA, PETG, ABS, etc.). This simplifies operation for beginners and saves time.
- Storage integration: If you want all-in-one storage and drying, consider SP2 or modular PolyDryer configurations that separate drying from storage while keeping workflows efficient.
- Display and control: LCD screens or indicator lights help track temperature, time, and humidity, aiding repeatable results.
- Maintenance and durability: Look for easy-to-clean interiors and components designed to last with regular filament use.
Common Questions
- How long should I dry filament? Typical cycles range from 30 minutes to several hours depending on material and humidity.
- Can I dry only some filaments? Yes, choose a model with adjustable time and temperature per filament type.
- Is a dryer box necessary for PLA? PLA is less hygroscopic than ABS or Nylon, but drying can still improve adhesion and print consistency in humid environments.
- Should I store filament after drying? Yes, store in a sealed container or vacuum bag to maintain dryness.
- Can I use a dryer box during printing? Some models allow timed drying while printing, but follow the manufacturer’s guidance for continuous operation.