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1.Perfect Compatibility: Exclusively designed for Anycubic Kobra S1 / S1C 3D printer extruder, ensuring a precise fit and normal filament detection function. 2. Premium Stainless Steel: Made of high-strength stainless steel for wear resistance, high temperature resistance, and longer service life than ordinary plastic flaps. 3. Stable Filament Detection: Reliably triggers the filament runout sensor to avoid empty printing, reduce failed prints and save filament material. 4. Easy to Install: Direct replacement part with simple installation; no complex tools or modifications needed, ideal for quick maintenance. 5. Package: Comes with 4 pieces of sensor flaps for spare or replacement, cost-effective and convenient for long-term use.