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This listing includes 10 pieces of MK7 MK8 heating blocks, specially designed for 3D printer extruder hotend replacement. Made of high-quality aluminum alloy, it features excellent thermal conductivity for fast and even heating. Precisely crafted structure fits perfectly with standard nozzles, heating rods and thermistors. High temperature resistance and stable performance ensure smooth filament melting during printing. Ideal replacement parts for daily repair, upgrade and batch maintenance of 3D printers.