Description : The advantage of the new improved version In the previous sensor does not work well with some specific fibers . The new sensor is using an optical sensor that is triggered Through simple mechanical levers . This sensor does not care about the optical properties of the filament ( it can be completely invisible ) and can not die because of mechanical wear . Specification : IR sensor assembly 1 . place the IR sensor on top of the body extruder and secure it with M2x8 . 2 . tighten M2x8 screws , the sensor should not be able to move , but be careful PCB is not unbreakable ;) 3 . Connect the cable , the correct orientation of the connector and wires . 4 . leave clearance for the sensor as in the picture . Do not create too large a loop as it can interfere with the framework . If necessary , adjust the length , gently pulling / pushing the cable . Package Includes : Filament sensor ( 1x ) Cable ( 1x ) M3x18 screw ( 1x ) M3x10 screw ( 1x ) M3nS nut ( 2x ) M3n notes ( 2x ) Steel ball ( 1x ) Magnet 10x6x2 ( 1x ) Magnet 20x6x2 ( 1x ) M2x8 screw ( 1x ) Note : Please allow 1 - 3mm error due to hand test . The color may have different as the different display . Thanks for your understanding and finding this item . Have a nice day