This is a 0.5mm E3D replacement nozzle for the E3D V5 and V6 hot end assemblies for 3mm filament.
The brass nozzle is a great general purpose, low cost option making it a favourite choice in the 3D printing community. Brass has a great balance of properties it is thermally conductive, machines precisely and easily even with very small nozzles and doesn't corrode or pit so retains a smooth surface finish for cleanly laying down extruded filament. The top of the nozzle is threaded in order to fit into the E3D V5 heater block or the E3D V6 heater block.
It is good to keep in mind that brass nozzles are vulnerable to abrasive erosion by more exotic filaments like carbon-fibre filled materials, metal powder filled materials and glow in the dark filaments and also may be damaged by nasty head crashes.
When swapping out E3D Nozzles from other E3D components, we recommend resorting to the hot tightening technique. Follow this procedure - being careful not to burn yourself.
The reason for this is that the aluminium heater blocks used by E3D have a higher coefficient of thermal expansion than the brass and steel used in the nozzles and heat breaks. This results in a small gap being created between the nozzle and the break inside the block when the hot end is at temperature, but this only happens if the nozzle has been tightened while cold.
*Note this is not supplied by E3D themselves it is manufactured to the same specs and quality controlled locally to ensure it functions exactly as expected while saving you money.
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