Functional 3D Printer Filament

Answer: ASA (Acrylonitrile Styrene Acrylonitrile). Unlike ABS, which turns yellow and becomes brittle under UV light, ASA is chemically designed to resist weather and UV radiation, making it the standard for automotive and outdoor applications.

Answer: Polycarbonate (PC) can handle up to 110–140°C. For extreme industrial needs, PEEK or PEI (Ultem) can withstand over 200°C, though they require specialized high-temp printers.

Answer: 4D filaments use shape-memory polymers. These parts are printed in one shape but can "react" to external stimuli—like heat or water—to fold, expand, or change shape after the print is finished.

Answer: Yes. These materials release VOCs (Styrene) and UFPs (Ultrafine Particles) that are respiratory irritants. In 2026, it is standard practice to use a printer with a HEPA/Carbon filtration system or to vent the enclosure outdoors.

Answer: Easy ABS is formulated to solve the two biggest pain points of standard ABS: high shrinkage and unpleasant odors. It features lower warping properties, meaning it can often be printed with less aggressive enclosure heating while maintaining the heat resistance and impact strength ABS is known for.

Answer: Adding 15% carbon fiber to PETG significantly increases the material's rigidity (modulus) and dimensional stability. While regular PETG is somewhat flexible, PETG-CF is much stiffer and has a premium matte finish that hides layer lines effectively.

Answer: TPU 90A is softer and more flexible (similar to a pencil eraser), making it better for gaskets and soft grips. TPU 95A is slightly harder (similar to a shopping cart wheel), which makes it easier to print on more machines while still providing excellent shock absorption and abrasion resistance.

Answer: While both are water-resistant, ASA is superior for long-term outdoor use because it is specifically UV-resistant. PETG can eventually become brittle under constant direct sunlight, whereas ASA maintains its color and mechanical integrity in harsh weather conditions.

Answer: MOQ stands for Minimum Order Quantity. For certain high-performance or bulk-priced filaments like PLA Meta or Carbon Fiber, Sunlu requires a minimum purchase of 3 or 6 rolls to unlock the discounted "bulk" pricing, which is a common trend for industrial and functional procurement.

Answer: The Refill version is designed to be used with a reusable "Master Spool" to reduce plastic waste. It is often sold as a 0.9kg coil to ensure it fits perfectly onto the standard reusable spool hubs while reducing shipping weight and environmental impact.