Feature:1. Alumina is a highhardness compound that is not easily corroded in the air.2. With accurate size holes, easy to install, very practical 3D printer extruder accessories.3. The product has high temperature performance, stable shrinkage, and durable.4. This product suitable for CR10/CR10S /Ender3/Ender3 Pro/CR10 S5/CR10 /MINI/CR20/CR20 PRO/TronXY X5S/Tevo Tornado/Alfawise U20.5. Complete tools, you can operate it yourself, suitable for DIY enthusiastsSpecification:Item Type: 3D Printer Extruder Upgrade Kit Material: Aluminum alloyModel: For CR-10 extruder heating block nozzle kitPipe Diameter: Approx. 1.75mm / 0.1inList: 1 x Upgraded Hose1 x Upgraded Cooling Block1 x Heating Block1 x Brass Nozzle 0.4mm1 x Silicone Case (Blue)1 x Orange Buckle2 x Wrench6 x Screw Assembly1 x AccessoriesApplicable Models: For CR-10/CR-10S /Ender-3/Ender-3 Pro/CR-10 S5/CR-10 /MINI/CR-20/CR-20 PRO/TronXY X5S/Tevo Tornado/Alfawise U20Recommended Slicer Settings: Retraction speed exceeds 80MM/SRetracted Length: Approx. 2.5 ~ 4mm / 0.1 ~ 0.2inBrass Nozzle: Approx. 0.4mm / 0.02in.Package List:1 x Upgraded Hose1 x Upgraded Cooling Block1 x Heating Block1 x 0.4mm Brass Nozzle 1 x Silicone Case (Blue)1 x Orange Buckle2 x Wrench6 x Screw Assembly1 x Accessory Note:If You Are Experiencing PLA Clogging, Please Try The Following: 1. Increase the retraction speed. The speed of trying to change the firmware may be limited. G command "M203 E200"2. Increase the acceleration of the extruder. Check your firmware settings. G command "M201 E9000"3. Shorten the retracted length. It depends on your machine settings.4. Increase the nozzle temperature by 5‑10 degrees.5. Do not install 2 screws to support the heat sink, for exampleCR‑10 printer.6. Make sure there is no gap between the radiator and the thermal circuit breaker.