If you’re new to 3D printing, or looking for a reliable, eco-friendly, and easy-to-use material, PLA (Polylactic Acid) filament is your best choice.
In this guide, we’ll cover everything you need to know about PLA filament: its key properties, best print settings, how to fix common issues, and proper storage.
What is PLA? Why Choose It?
PLA (Polylactic Acid) is a bio-based plastic made from renewable resources like corn starch or sugarcane.
Unlike petroleum-based plastics such as ABS, PLA produces almost no odor during printing and doesn’t release harmful fumes. This makes it perfect for indoor use — whether at home, in an office, or in a classroom.
Key Benefits of PLA
| Benefit | Why It Matters |
|---|---|
| Easy to print | No heated bed required, minimal warping — very beginner-friendly |
| Eco-friendly | Made from renewable plants, much lower carbon footprint than traditional plastics |
| Great surface finish | Prints come out smooth with excellent detail |
| Low odor | Slight sweet smell or completely odorless — no ventilation needed |
Best Print Settings for PLA
Here are our recommended starting settings. Begin here, then fine-tune based on your printer and model.
| Setting | Recommended Value |
|---|---|
| Nozzle Temperature | 190-220°C — start at 200°C |
| Bed Temperature | 0-60°C (PEI sheet or painter’s tape works best) |
| Print Speed | 40-60 mm/s |
| Layer Height | 0.1mm – 0.3mm |
| Cooling Fan | 100% — PLA needs strong cooling |
| Bed Adhesion | Brim or raft for large models to prevent warping |
💡 Pro tip: Different brands and colors of PLA may respond slightly differently to temperature. If extrusion seems poor, try increasing temperature by 5°C. If you see stringing, try decreasing by 5°C.
Common Problems & Solutions (FAQ)
Even with the easiest filament, issues can happen. Here are the most common problems and how to fix them.
Problem 1: Warping (corners lifting off the bed)
Possible causes:
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Bed temperature too low
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First layer height incorrect (nozzle too far from bed)
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Dirty or oily build plate
Solutions:
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Clean the build plate thoroughly with soap and water or isopropyl alcohol
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Set bed temperature to 50-60°C
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Lower first layer print speed (try 15-20 mm/s)
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Ensure the first layer is properly “squished” — about one sheet of paper gap between nozzle and bed
Problem 2: Under-extrusion (gaps or missing layers)
Possible causes:
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Printing temperature too low
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Partially clogged nozzle
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Extruder gear slipping
Solutions:
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Increase nozzle temperature by 5-10°C
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Clean the nozzle with a needle or perform a cold pull
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Check the extruder gear for debris or wear
Problem 3: Stringing (thin strings between parts)
Possible causes:
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Retraction settings too low (distance or speed)
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Printing temperature too high
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Moisture in filament
Solutions:
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Increase retraction distance (e.g., from 2mm to 5mm)
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Lower printing temperature by 5-10°C
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Dry your filament (see storage guide below)
Problem 4: Poor layer adhesion or brittle prints
Possible causes:
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Printing temperature too low
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Filament has absorbed moisture
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Cooling fan too high (for larger layers)
Solutions:
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Raise nozzle temperature by 5-10°C
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Dry your filament
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Reduce fan speed for larger layer heights (>0.2mm)
Storage & Maintenance
PLA is hygroscopic — it absorbs moisture from the air. Wet PLA becomes brittle, snaps easily, and causes bubbles, stringing, and poor surface quality during printing.
How to Tell if Your Filament Is Wet
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You hear “popping” or “sizzling” sounds while printing
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Small bubbles or pockmarks appear on the print surface
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The filament snaps easily when bent
Best Storage Practices
| Situation | Recommended Action |
|---|---|
| Short-term use | Keep in a cool, dry place away from direct sunlight |
| Long-term storage | Store in a sealed bag or vacuum container with desiccant packs |
| Already wet | Dry in a filament dryer at 50°C (122°F) for 4-6 hours |
💡 Recommendation: If you live in a coastal or high-humidity area, investing in a filament dryer is one of the best upgrades you can make for print reliability.
PLA vs. Other Materials: How to Choose
| Material | Strengths | Weaknesses | Best For |
|---|---|---|---|
| PLA | Easy to print, odorless, eco-friendly, great detail | Low heat resistance, somewhat brittle | Prototypes, models, education, art |
| PETG | Durable, flexible, better heat resistance | More stringing, slightly harder to print | Functional parts, outdoor use, containers |
| ABS | Heat-resistant, strong, can be sanded | Odor during printing, warping, needs enclosure | Engineering parts, automotive |
| TPU | Flexible, elastic | Slow printing, requires direct drive extruder | Gaskets, phone cases, wearables |
FAQs (Quick Answers)
Q: Do I need a heated bed for PLA?
A: No, PLA can be printed without a heated bed. However, a bed at 50-60°C improves first layer adhesion.
Q: Can PLA be used outdoors?
A: PLA is not UV-resistant and has a low heat deflection temperature (around 60°C). For outdoor use, consider PETG or ASA.
Q: Is PLA food-safe?
A: Plain PLA is technically non-toxic, but the printing process creates microscopic gaps where bacteria can grow. For food contact, use dedicated food-safe filament and a coated nozzle.
Q: Why does my PLA keep snapping?
A: Your filament is likely wet or has become brittle due to moisture. Dry it or replace it with a fresh spool stored with desiccant.
Q: What’s the shelf life of PLA?
A: Stored properly (sealed with desiccant, cool dry place), PLA can last 1-2 years. Exposed to humid air, it can degrade in weeks.
Conclusion
PLA is an excellent filament that combines ease of use, safety, and print quality. Whether you’re making detailed miniatures, functional prototypes, educational projects, or architectural models, PLA gets the job done.
We hope this guide helps you get better results with PLA filament. If you run into other issues, check out our other material guides in the Wiki or reach out to our support team.
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