Description: Heating is fast for our customers to use our thermistor with copper sleeve to improve the heating faster, the thermistor with a copper sleeve installed to make it more accurate temperature control and thermistor fixed and easy to solve the problem of damage. Suitable for Makerbot printers Screw: M6 and M3 (heating pipe and thermocouple) Heating tube: 6mm thermocouple: 3mm Package Includes: 1x Assembled Extruder Hot End Kits