How to store the filaments to keep them in top condition

If you’re a 3D printing enthusiast or professional, chances are you’ve collected multiple spools of filament. But did you know that improper filament storage can lead to moisture damage, brittleness, and poor print quality?

This guide explains why filament storage matters and outlines the best methods to keep your spools in top condition, including advanced solutions like the PolyBox Edition II, Polydryer, Polydryer Box, and PrintDry.

Why Proper Filament Storage Matters

Most 3D printing filaments are hygroscopic, meaning they absorb moisture from the air. When this happens:

• Hydrolysis breaks down the polymer structure during heating.

• Prints from “wet” filament show rough surfaces, brittleness, and stringing.

• Printers may need higher extrusion temperatures, which increases wear and tear.

Filaments Most Affected by Moisture

• Nylon

• Polycarbonate (PC)

• Copolyester (PETG)

• PVA (support material)

Simple Storage Methods

1. Vacuum Bagging

Store spools in vacuum-sealed bags with desiccant packs to keep out moisture.

Pros:

• Low cost

• Easy to set up

• Space-saving

Cons:

• Re-sealing takes effort

• Limited convenience for frequent filament changes

2. Airtight Dry Boxes

Plastic containers with silica gel or rechargeable desiccant packs help regulate humidity.

Pros:

• Affordable and reusable

• Easy to access spools

• Works for multiple filaments

Cons:

• Less effective in very humid environments

• Needs regular monitoring of desiccants

3. Filament Dryers

Compact dryers can both dry filament and keep it dry while printing.

Pros:

• Active moisture removal

• Some models allow printing directly from the dryer

• Consistent print quality

Cons:

• More expensive than bags or boxes

• Requires power

Advanced Filament Storage Solutions

PolyBox Edition II

Designed for multiple spools, with built-in humidity control and compatibility with hygroscopic filaments like Nylon, PC, and PVA.

Pros:

• Continuous humidity monitoring

• Can print directly from the box

• Fits multiple spool sizes

Cons:

• Higher upfront cost

• Bulkier than DIY options

Polymaker Polydryer + Polydryer Box

The Polydryer removes moisture effectively, while the Polydryer Box offers sealed storage to maintain dryness after treatment.

Pros:

• Complete drying and storage system

• Designed for sensitive filaments

• Keeps spools ready for immediate use

Cons:

• Requires more space

• Higher cost than standard storage

PrintDry

A trusted solution for drying and storing filaments, supporting both small and large-scale 3D printing operations.

Pros:

• Reliable drying performance

• Flexible storage capacity

• Widely used in professional setups

Cons:

• Investment needed for multiple units

• Requires power and monitoring

Conclusion

Storing your 3D printing filaments correctly is essential to protect your investment and achieve consistent print quality. While vacuum bags and dry boxes provide affordable solutions, advanced systems like the PolyBox Edition II, Polydryer with Polydryer Box, and PrintDry deliver long-term reliability and convenience.

Choose the method that best suits your printing needs and scale - and ensure your filaments are always ready to produce high-quality prints.