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A bad assembled hotend is the reason for leaking. To fix this screw the throat so that it touches the nozzle. Make sure that you don't place the throat upside down. Usually at one end of the throat the PTFE Tube comes out slightly, this is the end that has to touch the nozzle. On the other end the tube is not aligned with the throat and has a 40° angle to guide the Filament into the tube, this is the end that goes into the Extruder.