3D Printing Materials Compared: PLA vs ABS vs PETG vs Nylon [2026]
Updated February 2026 · 12 min read
Choosing the right 3D printing material is the single most important decision you'll make when ordering a printed part. The material determines strength, flexibility, heat resistance, appearance, and cost. Yet most people default to PLA because it's the cheapest option — even when their application calls for something completely different.
This guide compares the four most common FDM filament materials head-to-head: PLA, ABS, PETG, and Nylon. We'll cover the real-world properties that matter — not just datasheet numbers — so you can pick the right material for your specific project. For a broader overview of printing technologies, see our FDM vs SLS vs Resin guide.
Quick Comparison Table
| Property | PLA | ABS | PETG | Nylon |
|---|---|---|---|---|
| Tensile Strength | 37 MPa | 40 MPa | 50 MPa | 70 MPa |
| Flexibility | Low (brittle) | Medium | Medium | High |
| Heat Resistance | 60°C | 100°C | 80°C | 180°C+ |
| UV Resistance | Poor | Poor | Good | Good |
| Chemical Resistance | Poor | Fair | Good | Excellent |
| Ease of Printing | Easy | Hard | Easy | Hard |
| Filament Cost/kg | $15–$25 | $15–$30 | $20–$35 | $30–$60 |
| Service Cost/Part | $ | $$ | $$ | $$$ |
Values are representative ranges for standard formulations. Specialty blends (carbon-filled, glass-filled) will differ.
PLA — The Default Choice (and When to Move Past It)
PLA (Polylactic Acid) is the world's most popular 3D printing filament for good reason: it's cheap, it prints easily on any FDM machine, it produces clean surface finishes, and it comes in every color imaginable. It's derived from cornstarch, making it one of the few biodegradable options.
The catch? PLA is brittle and has poor heat resistance. Leave a PLA part in a car on a hot day and it will warp. Drop it on a hard floor and it may crack rather than flex. It also degrades under UV exposure, so it's not suitable for long-term outdoor use.
Use PLA when:
- • Visual prototypes and concept models
- • Trade show displays and presentation pieces
- • Artistic and decorative items
- • Fit-check prototypes (does the shape work?)
- • Any indoor, room-temperature application without mechanical stress
Avoid PLA when:
- • Parts will be near heat sources (>55°C)
- • Parts need to survive impacts without cracking
- • Outdoor or UV-exposed applications
- • Any load-bearing or mechanical function
ABS — The Legacy Engineering Plastic
ABS (Acrylonitrile Butadiene Styrene) is the same plastic used in LEGO bricks, automotive dashboards, and power tool housings. It's tougher than PLA, handles higher temperatures (up to 100°C), and can be vapor-smoothed with acetone to produce near-injection-mold surface finishes.
The problem with ABS is that it's notoriously difficult to print. It warps aggressively during cooling, requires an enclosed, heated build chamber, and emits styrene fumes that need ventilation. Many local shops avoid it entirely or charge a premium because of the higher failure rate and equipment requirements.
Use ABS when:
- • You need acetone vapor smoothing for a glossy finish
- • Parts will be near heat sources (under-hood automotive, electronics enclosures)
- • Impact resistance matters but not critical-load strength
- • You're matching an existing ABS injection-molded part
Consider alternatives when:
- • PETG often delivers similar strength with much easier printing
- • ASA is a UV-stable drop-in replacement for outdoor use
- • Budget is tight — ABS failure rates mean shops charge more
PETG — The Best All-Rounder
PETG (Polyethylene Terephthalate Glycol) has quietly become the go-to material for functional 3D-printed parts. It combines the ease of printing you get with PLA with mechanical properties closer to ABS — and adds UV resistance and chemical resistance that neither PLA nor ABS can match.
PETG is FDA-approved for food contact (in its raw form), resists most common chemicals, doesn't warp during printing, and has good layer adhesion that makes it stronger than PLA in real-world use. It does string a bit more during printing and the surface finish isn't quite as clean as PLA, but these are minor trade-offs for functional parts.
Use PETG when:
- • Functional parts that need to survive real-world use
- • Outdoor or UV-exposed applications
- • Food-contact applications (with proper post-processing)
- • Chemical exposure (lab equipment, industrial environments)
- • You want the most reliable print with good mechanical properties
Limitations:
- • Surface finish slightly worse than PLA (more stringing)
- • Not as strong as Nylon for high-stress applications
- • Softens at ~80°C — not suitable for high-heat environments
Nylon — Maximum Performance
Nylon (Polyamide, typically PA6 or PA12) is the strongest and most versatile FDM material. It has the highest tensile strength, excellent fatigue resistance (it can flex thousands of times without breaking), outstanding chemical resistance, and heat tolerance up to 180°C+ depending on the grade.
The trade-off is that Nylon is the most demanding material to print. It absorbs moisture from the air, which causes defects during printing — filament must be dried before use and ideally printed in a dry enclosure. It also warps significantly, requiring an enclosed heated chamber. Nylon parts printed via FDM are often supplemented by SLS-printed Nylon (PA12), which produces stronger, more isotropic parts.
Use Nylon when:
- • Maximum strength and durability are non-negotiable
- • Parts need to flex repeatedly without breaking (living hinges, snap fits)
- • High-temperature environments (>100°C)
- • Chemical exposure to oils, fuels, or solvents
- • End-use production parts (especially via SLS)
Keep in mind:
- • FDM Nylon costs 2–3× more than PLA at most shops
- • Moisture sensitivity means not every shop will offer it
- • For production quantities, SLS Nylon is often better and more cost-effective
Decision Framework: Which Material Should You Choose?
Ask yourself these three questions to narrow down your material choice:
- Is it a visual model or a functional part? If it's purely visual (concept models, display items, trade show pieces), use PLA. It's cheapest and looks best.
- Will it be outdoors or near heat? If yes, eliminate PLA and ABS. Use PETG for moderate conditions, Nylon for extreme heat or chemical exposure.
- Does it need to survive impacts or repeated flexing? If yes, PETG is the minimum. Nylon if the stakes are high.
When in doubt, PETG is the safest choice for functional parts. It's the best balance of strength, printability, and cost. Reserve Nylon for demanding applications where nothing else will do, and PLA for anything that's purely decorative or disposable.
Beyond the Big Four
These four materials cover 90% of FDM printing jobs, but there are specialty options worth knowing about: TPU for flexible rubber-like parts, ASA as a UV-stable ABS replacement, Polycarbonate for extreme impact resistance, and carbon-fiber-filled variants of PETG or Nylon for stiffness without weight. Many shops in our materials directory list their full material availability, making it easy to find specialty options.
Find a Shop With Your Material
Browse our directory of 500+ 3D printing services and check each listing's material availability. You can also explore our category pages to find shops that specialize in your industry.
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