3D printing for outdoor applications requires materials that can withstand exposure to the elements—particularly UV radiation, moisture, and temperature fluctuations. One of the most common questions we receive is:
“What is the best 3D printing filament for outdoor use?”
In this guide, we explore UV-resistant 3D printing filaments, their applications, and which materials offer the best longevity in outdoor environments.
Why Material UV Resistance Matters for Outdoor 3D Printing
Exposure to sunlight is one of the biggest challenges for outdoor 3D-printed parts. UV rays can degrade plastic materials over time, leading to:
- Discolouration & Fading – Aesthetic changes that make prints look worn or aged.
- Brittleness & Cracking – Structural weakening, causing failure over time.
- Reduced Strength – Loss of mechanical integrity, affecting load-bearing capacity.
Choosing a filament with strong UV resistance ensures that outdoor 3D prints remain durable, structurally sound, and visually appealing for extended periods.
3D Printing Applications of UV-Resistant Filament Materials
Weatherproof Signage – Business and public signs exposed to sunlight. 3D printing service, Lunia 3D, have previously produced 3D printing signage using Filamentive ASA.
Architectural Models & Outdoor Structures – Custom-built parts for landscaping, pavilions, or functional enclosures. At the 2018 RHS Chelsea Flower Show, ‘The Pearlfisher Garden’ featured a 3D-printed sculpture of a Pearl Diver made from recycled PLA plastic.
3D Printed Lighting Installations – Urban lighting displays that require long-term outdoor durability. To reinvent spaces in Belfast city centre Urban Scale Interventions designed a sustainability themed lighting installation, 3D-printed using Filamentive recycled PETg filament.
To ensure longevity, selecting a UV-resistant filament is essential for these applications.
PLA Filament UV Resistance – Suitable for Outdoor 3D Prints?
PLA (Polylactic Acid) is the most widely used 3D printing filament, chosen for its ease of printing, affordability, and plant-based origin. It is used in everything from hobbyist prints to industrial prototyping.
How Does PLA Handle UV Exposure?
- Moderate UV resistance – PLA does not degrade instantly in sunlight, but prolonged exposure can lead to fading and embrittlement.
- Low heat resistance – With a glass transition temperature (Tg) of ~57°C, PLA can soften and deform in direct sunlight, especially in hot summer conditions.
Verdict: Can PLA Be Used Outdoors?
While PLA filament is not ideal for long-term outdoor exposure, Tough PLA grades offer better mechanical durability. However, PLA is not recommended for structural outdoor applications where longevity and weather resistance are required.
PETG Filament UV Resistance – Suitable for Outdoor 3D Prints?
PETG (Polyethylene Terephthalate Glycol-Modified) is becoming one of the most popular 3D printing materials due to its:
✔️ Higher strength & durability than PLA
✔️ Good chemical resistance
✔️ Odour-neutral and easy to 3D print
How Does PETG Handle UV Exposure?
- High UV resistance – PETG retains colour and mechanical properties better than PLA under sunlight.
- Improved heat resistance – With an HDT of ~70°C and Tg of 77°C, PETG is less prone to warping than PLA in hot, outdoor weather conditions.
Verdict: Can PETG Be Used Outdoors?
Yes! PETG is an excellent choice for outdoor 3D prints, offering a balance between printability, durability, and UV resistance. However, for long-term exposure in harsh environments, ASA filament may be a better option for your 3D printing project.
ASA Filament UV Resistance – Suitable for Outdoor 3D Prints?
ASA (Acrylonitrile Styrene Acrylate) is widely regarded as the best UV-resistant 3D printing filament for outdoor applications. It is commonly used in automotive parts, outdoor enclosures, and industrial-grade, weatherproofing applications.
How Does ASA Handle UV Exposure?
- Best-in-class UV resistance – ASA is 10× more UV resistant than ABS, making it the go-to filament for outdoor durability.
- Strong mechanical properties – ASA is impact-resistant and maintains its strength even in harsh environments.
- Weatherproof & aesthetic – Unlike ABS, ASA does not yellow or fade in the sun.
Verdict: Can ASA Be Used Outdoors?
Absolutely! ASA is the most UV-resistant filament available for 3D printing. It is the preferred choice for long-lasting, weatherproof prints that need to withstand the UK’s unpredictable climate.
Comparison: Best Outdoor 3D Printing Filaments in 2025
| Filament | UV Resistance | Heat Resistance | Outdoor Suitability |
| PLA | Moderate | Low (~57°C Tg) | Not recommended for long-term outdoor use |
| PETG | High | Moderate (~77°C Tg) | Suitable for outdoor use with occasional sun exposure |
| ASA | Very High | High (~95°C Tg) | Best choice for long-term outdoor durability |
Where to Buy UV-Resistant 3D Printer Filament in the UK?
Looking for high-quality UV-resistant filament for your outdoor 3D printing needs? Filamentive offers sustainable, high-performance filaments designed for durability and longevity.
As the UK-leading filament supplier, we offer high levels of UK stock, free next day UK delivery and even bulk filament discount for volume or business 3D printing users.