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What filament is best for strong parts?

For maximum strength, Polycarbonate (PC) offers the best impact resistance, while Carbon Fiber-reinforced Nylon (PA-CF) provides the highest stiffness and structural integrity. Nylon is superior for parts that need to flex without breaking, and TPU is the best for shock-absorbing or flexible components. For general-purpose functional parts, PETG provides a reliable balance of strength and durability, while ASA is essential for any applications exposed to outdoor UV conditions.