Features 1、EFFECTIVE PREVENT SCALDING: Silicone sock heater block cover can effectively keep heating block and nozzle around clean, which has a certain role in preventing burns 2、HEAT RESISTANT MATERIAL: Heater block cover is made of heat resistant silicone, which is not adhered to other printing materials and easy to tidy up 3、THERMAL INSULATION: The thermal insulation sleeve has good thermal insulation characteristics, which can effectively keep the temperature of the heating block stable, especially if the printing head is equipped with a model cooling fan for cooling printing, which can effectively keep the temperature of the heating block from being affected by the surrounding wind, and improve the printing quality 4、APPLICABLE MATERIALS: Heater block silicone cover has better temperature resistant and longer service life, supporting the use of PLA, ABS, TPU, HIPS, WOOD, PETG and other materials 5、ELASTIC AND NON SLIP: 3D printer heater block silicone cover has good elasticity, can be installed more closely with the heating block, and is not easy to fall off 6、APPLICABLE MODEL: Heater block cover is compatible with for Prusa MK3.9, for Prusa MK4, for Prusa XL and does not work with the original for prusa I3, MK2, MK2.5, MK3, MK3S, MK3S+ Mini Specification Item Type: Silicone Sock Heater Block Cover Material: Silicone Product Size: Approx. 24 x 16 x 15mm / 0.94 x 0.63 x 0.59in Temperature Resistor: 280℃ Function: Prevent hot, protect the heating block Color: Black Package List 3 x Silicone Sock Heater Block Cover