Only Compatible with Creality Ender 3 V3 SE/Ender 3 V3 KE 3d Printer not fit for other printers. Smooth filament travelling The filament sensor has a built-in filament guider which is made of metal material with smooth surface reducing friction resistance and ensuring smooth filament feed-inPrecise Detection Blue LED indicates normal filament feed-in when the Blue LED turns off it means filament runs outUpgraded DesignIt is redesigned with new inner structure. The outer cover is frosted making it stylish and unique. Simple structure easy to install