The E3D V5 Heater Block is a component that is used in the hotend of a 3D printer. It is a specific type of heater block that is manufactured by the company E3D and is designed to fit their V5 hotend.

The heater block is responsible for holding the heating element and the thermistor, which are the two main components that are used to heat the filament in the hotend. The heating element is typically made of a resistance wire, such as nichrome, that is wrapped around the block and then connected to a power supply. The thermistor is a temperature sensor that is used to measure the temperature of the filament as it is being heated.

The heater block is typically made of aluminum and is designed to be thermally conductive, which helps to evenly distribute heat throughout the block and maintain stable temperatures during printing. The V5 version of the heater block is designed to be smaller and more compact than previous versions and is compatible with a wide range of filaments.

The E3D V5 Heater Block is a common component in the 3D printing community and is considered to be a reliable and high-performance option for those who want to achieve high-quality prints and fine details. It is widely used among the 3D printing enthusiasts and professionals.

The heater block is basically a small machined aluminum block. It has a CNC drilled and tapped thread right the way through the top that accepts the V5 heat break and E3D nozzle. It also has CNC drilled holes that accept the heater cartridge as well as 100kΩ 1% NTC thermistor. The heater cartridge is used to heat up the heater block to the desired temperature which intern heats up the hot end of the heat break and nozzle allowing smooth extrusion of the filament. The Thermistor is used to read and monitor the temperature of the heater block allowing for accurate closed loop PID temperature control