3D printing filament material selection determines your part's mechanical properties, temperature resistance, UV stability, and printability. PLA is the default beginner material, but for functional parts exposed to heat, stress, or weather, upgrading to PETG, ASA, or Nylon can make the difference between success and failure.
Find Material for Your Requirements
| Material | Strength | Heat (°C) | UV Resist | Flexibility | Printability | Cost/kg |
|---|---|---|---|---|---|---|
| PLA | ★★★☆☆ | 55–65°C | Poor | Rigid | Excellent | $15–25 |
| PETG | ★★★★☆ | 70–80°C | Fair | Slightly flexible | Very Good | $20–35 |
| ABS | ★★★★☆ | 90–100°C | Poor | Rigid | Difficult | $20–30 |
| ASA | ★★★★☆ | 95–100°C | Excellent | Rigid | Moderate | $25–45 |
| Nylon (PA12) | ★★★★★ | 85–95°C | Fair | Semi-flexible | Difficult | $35–60 |
| TPU (95A) | ★★★☆☆ | 70–80°C | Fair | Flexible | Moderate | $25–45 |
| PLA+ / Tough PLA | ★★★★☆ | 60–70°C | Poor | Rigid | Excellent | $20–30 |
How to Choose the Right 3D Printing Material
Material selection should start with the application requirements, then work backwards to printability. Using PLA for an engine bay bracket or an outdoor fixture will result in failure. Spending extra on the right material is far cheaper than reprinting after failure.
Start with PLA, Upgrade When Needed
PLA is the best starting material — it prints at 200-220°C, requires no enclosure, has minimal warping, and produces excellent visual quality. Upgrade to PETG when you need better layer adhesion, chemical resistance, or light flexibility. Upgrade to ASA for outdoor parts. Use Nylon for high-stress mechanical parts requiring impact resistance and toughness.
PETG: The Practical Workhorse
PETG deserves special mention as the best general-purpose upgrade from PLA. It prints at 230-250°C with a 70-80°C bed, requires no enclosure, and provides dramatically better layer adhesion than PLA. PETG parts can withstand 70-80°C temperatures — safe for most mechanical applications outside of extreme heat environments. Chemical resistance to common solvents is significantly better than PLA.
Nylon: Handle With Care
Nylon is extremely hygroscopic — it absorbs moisture from ambient air within 24-48 hours, degrading print quality with bubbling, stringing, and poor layer adhesion. Always dry Nylon at 70-80°C for 6-12 hours before printing, and print immediately from a sealed dry box. An enclosed printer with chamber temperatures above 40°C significantly improves Nylon print quality.
FAQ
Is this comparison guide free?
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What is the strongest common 3D printing filament?
Nylon (PA12) has the best impact strength and flexibility of common materials. For tensile strength, ASA and ABS are comparable. PETG is slightly weaker than ABS but much tougher at impact. For strength-to-printability ratio, PETG is often the best choice — nearly as strong as ABS but much easier to print.
What filament should I use for outdoor parts?
ASA (Acrylonitrile Styrene Acrylate) is specifically designed for UV and weather resistance — the best common FDM material for outdoor use. ABS degrades and becomes brittle in UV light. PETG tolerates outdoor exposure reasonably well short-term. PLA should not be used outdoors — it degrades within months in sunlight and heat.
What temperature can PETG handle?
PETG softens at 70-80°C (heat deflection temperature). This makes it unsuitable for applications near automotive engines or other heat sources but adequate for most indoor uses. ABS handles 90-100°C, ASA handles 95-100°C. PLA is the weakest with heat deflection around 55-65°C — it can deform in a hot car in summer.
Why is ABS harder to print than PETG?
ABS warps significantly due to differential thermal contraction during cooling. It requires an enclosed printer, heated bed at 100-110°C, and no drafts. Failed first layers are common without enclosure. PETG has minimal warping, adheres well at 80°C bed temperature, and prints successfully on open-frame printers. For most makers, PETG gives ABS-like properties with PLA-like printability.