Using the E3D V6 Aluminium Heater Block for Sensor Cartridges is easy. First, make sure your E3D - v6 HotEnd is powered off. Then, you can choose to use our New Standard thermistor sensor, high - temperature PT100 sensor, or Type - K Thermistor cartridge. Insert the chosen sensor into the hole of the heater block. If you're using the PT100 sensor, use the M3 grub screw to secure it firmly. When you want to change the sensor later, just loosen the screw. For maintenance, keep the heater block clean. After long - term use, check for any signs of wear or damage. If you notice any issues, don't hesitate to contact us. Always handle the heater block with care to avoid any physical damage. Also, when powering on the E3D - v6 HotEnd, make sure all connections are secure to ensure safe and proper operation.