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Premium PTFE Specifications: High-quality Teflon tube designed for 1.75mm filament, featuring a precise 1.9mm ID and 4mm OD for optimal fit. Perfect for Flexible Filaments: The tight 1.9mm ± 0.05mm inner diameter minimizes play and buckling, enabling reliable printing of flexible materials even on long Bowden setups. Extreme Durability: Engineered to withstand extreme temperatures and harsh chemical environments without degrading. Ultra-Low Friction: Chemically inert with low permeability, offering the lowest friction coefficient of any tubing for seamless filament flow. Enhanced Print Performance: Reduces retraction needs and prevents slippage, minimizing extruder wear while delivering higher print accuracy.