When you invest in 3D printer filament, whether you’re a weekend hobbyist or a full-time maker, one question inevitably comes up: how long does 3D printer filament last? The answer depends on multiple factors, including the type of filament, how you store it, and how frequently you print. In this guide, we’ll break down what impacts filament lifespan, how to store it properly, and how to know when it’s time to toss or revive a spool.
Factors That Affect Filament Lifespan
Not all filaments are created equal—each type has unique properties that affect how long it lasts. The most common materials like PLA, PETG, ABS, and TPU each react differently to environmental conditions.
PLA (Polylactic Acid) is biodegradable and tends to be more sensitive to moisture. It may become brittle within a year if exposed to humidity. ABS is more durable but still hygroscopic (absorbs moisture), leading to print inconsistencies. PETG holds up better against moisture than PLA but still benefits from dry storage. TPU (flexible filament) can last long when stored correctly, but once it absorbs moisture, prints suffer from bubbling and poor layer adhesion.
Environmental factors like humidity, light exposure, and temperature swings also play a significant role in filament degradation. Direct sunlight and high humidity can cause filaments to warp, become brittle, or degrade chemically.
How Long Does 3D Printer Filament Last Unused?
In ideal conditions, most filaments can last 12–24 months unused, and some even longer. The shelf life significantly increases if the filament is stored in a sealed bag with desiccants and kept in a cool, dry place.
However, if left exposed to open air, especially in humid environments, you may notice signs of degradation in just a few months. PLA is especially notorious for becoming brittle and snapping easily when it absorbs moisture. PETG and ABS degrade more slowly but still lose their optimal printing characteristics over time.
Signs that your filament might be going bad include:
- Cracking or snapping when unspooled
- Discoloration or surface roughness
- Increased stringing, blobs, or under-extrusion during prints
How Long Does Filament Last While Printing?
The lifespan during printing is more about how much filament you use than time. A standard 1kg spool of PLA can last between 30–50 hours of printing, depending on your nozzle size, infill percentage, and the size of your models.
For example:
- A small 3DBenchy might use 15–20 grams of filament.
- A helmet or large vase could use over 500 grams.
The more dense and high-resolution your prints are, the quicker you’ll go through your filament.
Best Practices for Storing Filament
To maximize your filament’s life, you must protect it from moisture and extreme temperatures. Here are proven storage tips:
- Airtight Containers: Store spools in airtight bins or vacuum-sealed bags.
- Desiccants: Add silica gel packs or calcium chloride to absorb moisture.
- Filament Dry Boxes: These maintain optimal humidity and are especially useful if you print often.
- Avoid UV Exposure: Keep filament away from windows or fluorescent lighting.
Even unopened vacuum-sealed spools should be stored in a dry area to avoid accidental punctures or seal failures that expose them to the environment.
How to Tell If Your Filament Is No Longer Good
Not sure if your spool is still usable? Try these quick checks:
- Snap Test: Try gently bending the filament. If it snaps easily, it’s likely brittle and compromised.
- Visual Check: Look for cracks, uneven coloration, or a rough texture.
- Print Quality: If you notice stringing, under-extrusion, or poor bed adhesion, moisture may be the culprit.
Can You Revive Old or Moist Filament?
In many cases, yes! If the filament isn’t physically damaged or degraded, drying it may restore its usability.
- Oven Drying: Bake PLA at ~40–45°C (104–113°F) for 4–6 hours; PETG and ABS at slightly higher temps.
- Dedicated Filament Dryers: Designed to dry and store filament simultaneously—ideal for regular users.
- Check Before Big Prints: Try a small test model to assess print quality before committing to a large job.
Reviving filament is cost-effective, but if the spool shows signs of permanent damage, it’s better to replace it to avoid wasting time and materials.
Final Thoughts
Understanding how long 3D printer filament lasts helps you plan better, reduce failed prints, and save money. With the right storage methods and regular checks, your filament can stay fresh for well over a year. Whether you’re storing premium PLA, durable PETG, or flexible TPU, keeping your spools dry and protected is the key to long-lasting performance. For high-quality filament built to last, browse the wide selection available at FILA LAB, where every spool is crafted with print-ready durability in mind.
Frequently Asked Questions
Does filament last longer in a vacuum bag?
Yes, vacuum sealing prevents moisture absorption and significantly extends shelf life.
Can filament go bad even if it’s sealed?
Over very long periods, yes—but a well-sealed spool can last several years without issues.
Is it okay to store filament in a garage or basement?
Only if it’s completely dry and temperature-stable. Otherwise, it’s better to keep it indoor