Compatible models include K1, K1 Maximum, K1C, Ender 3 V3, Ender 3 V3 Plus. This extruder gear set is a reliable replacement part for these printers. - Hard and wear resistant: heat-treated to a flat hardness of 55 HRC, enabling durable performance under continuous use. - Enhanced durability: the integrated filament drive gear for the K1-series extruder uses a solid steel construction, delivering outstanding durability and longevity. - Corrosion resistant material: nickel coating on hardened steel prevents rust, helping the gears last longer and stay well lubricated, resulting in robust reliability. Use scenarios: - Replace worn extruder gears on K1 family printers or Ender 3 V3/ V3 Plus to restore performance. - Retrofit Ender 3 V3 or Ender 3 V3 Plus to improve extrusion reliability for long prints or demanding materials. - Ideal for continuous operation in hobbyist or prototype projects requiring durable, low wear extrusion components.