How to Store PLA Filament for Optimal 3D Printing Results

Proper storage of PLA filament is essential to ensure consistent and high-quality 3D printing results. Neglecting this critical step can lead to brittle materials, poor print quality, and even damage to your 3D printer. This guide will walk you through why proper PLA filament storage matters and provide practical tips to keep your filament in top condition.

Why Is Proper Storage Important for PLA Filament?

PLA filament, widely used in 3D printing, is a biodegradable plastic made from renewable resources like corn starch and sugarcane. Its versatility and eco-friendliness make it a popular choice, but its hygroscopic nature—the tendency to absorb moisture from the air—makes proper storage crucial.

Key Reasons to Store PLA Filament Correctly:

• Prevent Moisture Damage: PLA absorbs moisture, which can lead to bubbling, uneven layers, and poor adhesion during printing.
• Maintain Print Quality: Exposure to moisture affects filament consistency, resulting in lower-quality prints.
• Preserve Material Strength: Moisture can make the filament brittle, causing frequent breaks during printing.
• Avoid Printer Issues: Wet filament can create steam and bubbles during extrusion, leading to nozzle clogs and mechanical issues.

Best Practices for Storing PLA Filament

To avoid these problems, follow these expert storage tips to keep your PLA filament dry and functional.

1. Use Airtight Storage Containers

Invest in airtight storage containers to shield your PLA filament from humidity and dust. Clear or translucent containers are ideal as they allow you to monitor the condition of the filament without opening the container. For additional protection, consider using desiccants like silica gel packs to absorb residual moisture. When using desiccants, regularly inspect and replace them as needed to maintain their effectiveness.

2. Store Filament in a Dry Environment

A stable environment with low humidity is crucial for PLA filament. A room with a relative humidity level below 50% is ideal. If you’re in a particularly humid area, consider using a dehumidifier to maintain optimal conditions. Ensure that the storage area is away from windows or any sources of water, as these can increase humidity levels.

3. Vacuum-Seal Filament Spools

Vacuum sealing is a highly effective method for long-term storage. By removing air and creating a tight seal around the filament, you minimize exposure to moisture. Many vacuum-sealing kits include reusable bags and hand pumps, making this an affordable and convenient option. To ensure an even better seal, double-check the bags for any small tears or openings before sealing.

4. Organize Filament on Shelves

Proper organization helps maintain the shape and usability of your filament. Store spools vertically on shelves to prevent deformation and tangling. Avoid stacking spools on top of each other, as this can cause warping or pressure damage over time. Ensure the shelves are placed in a dry and stable environment away from direct sunlight and heat sources to protect the filament’s properties.

5. Use a Filament Dry Box

Filament dry boxes are specifically designed to maintain a low-humidity environment. Some advanced models even include built-in heaters to remove existing moisture from the filament. These boxes are a great investment for frequent 3D printing enthusiasts, especially in regions with high humidity. Regularly clean and inspect the dry box to ensure it continues to function effectively.

6. Keep Filament Spools Labeled and Rotated

Label each spool with details like purchase date, filament type, and color. This not only helps you track your inventory but also ensures that older spools are used first. Rotating your stock reduces the chances of older filament degrading due to extended storage.

7. Use Hygrometers for Monitoring

Place a small hygrometer inside your storage containers or storage area to monitor humidity levels. These devices provide real-time data, allowing you to take quick action if humidity starts to rise. Hygrometers are an inexpensive tool to add another layer of protection for your filament.

How to Revive Moisture-Damaged PLA Filament

If your PLA filament has already absorbed moisture, don’t discard it just yet. You can often restore it with one of these methods:

1. Filament Dryer

A filament dryer is the most efficient way to remove moisture. Place the filament in the dryer, set the appropriate temperature (typically around 50°C), and let it run for a few hours.

2. Conventional Oven

If you don’t have a filament dryer, a standard oven can work as a substitute. Preheat the oven to 50–60°C, place the filament on a baking tray, and let it sit for 3–4 hours. Check periodically to ensure the filament doesn’t overheat or melt.

3. Dry Box with Desiccant

After drying the filament, store it in a dry box with silica gel packs to prevent it from reabsorbing moisture. This method is particularly useful for minor moisture issues.

Additional Tips for PLA Filament Storage

• Avoid Direct Sunlight: PLA is sensitive to UV rays, which can degrade the material over time. Always store it in a shaded or dark area.
• Label Your Spools: Clearly label each spool with the type and color of filament, as well as the purchase date, to keep track of your inventory.
• Check Regularly: Periodically inspect your filament for signs of moisture absorption, such as discoloration, brittleness, or surface roughness.

Conclusion

Proper storage of PLA filament is essential for achieving consistent and high-quality 3D printing results. By using airtight containers, maintaining a dry environment, and investing in tools like vacuum sealers or filament dryers, you can protect your filament from moisture damage. These steps not only enhance print quality but also extend the lifespan of your filament and ensure smooth 3D printing operations.