2PCS Hardened Steel Nozzles 0.4mm for K2/K2 Pro/K2 Plus/Hi Combo Hotend Upgraded materials,wear-resistant,quick-swap,high-flow/high-speed printing 3D Printer

QUICK-SWAP: The nozzle and heatbreak feature an all-metal integrated design for quick removal and easy replacement, minimizing downtime during frequent filament changes and maintenance while improving overall printing efficiency. HIGH-FLOW & HIGH-SPEED PRINTING: The optimized and enlarged melt chamber increases the effective melt zone, supporting high-speed printing at 600 mm/s. With PLA at a printing temperature of 220°C and a 0.4 mm nozzle, the maximum flow rate can reach 30 mm³/s. Compatible with K2, K2 Pro, K2 Plus and Hi Combo 3D Printers. UPGRADED MATERIALS: The titanium alloy heatbreak features low thermal conductivity to reduce unwanted heat transfer and help minimize heat creep. The copper alloy and hardened steel nozzle combines efficient heat transfer with excellent wear resistance for faster filament melting and long-lasting durability. PRECISION MACHINED FOR RELIABLE PERFORMANCE: Precision-fit joints help prevent molten filament leakage during printing. An inner bore roughness of Ra < 0.4 μm ensures smooth and consistent filament flow, while the burr-free nozzle orifice promotes stable extrusion and helps reduce the risk of clogging. WIDE FILAMENT COMPATIBILITY: Compatible with PLA, PETG, Nylon, ABS, ASA, TPU, TPE, PP, PC, Silk PLA, and a wide range of filled filaments, including carbon-fiber-filled filaments such as PLA-CF, PA-CF, PETG-CF and PET-CF, as well as glass-fiber-filled, glow-in-the-dark, metal-filled, wood-filled, and other abrasive composite filaments.