The nozzle is the component of a 3D printer that deposits the molten filament into the build area. There are many different types of 3D printer nozzles available and leveraging their different strengths is important. Standard brass nozzles are great for general purpose 3D printing.
The fan blows cold air onto the heat sink, so the heat sink deflects the heat from the upper part of the silver column and the filament stays rigid. The rigid filament pushes down on the molten filament and also creates a pressure or force on the molten filament, thus extruding it out of the tiny hole in the nozzle.
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