Check this guide on how to clean your hotend and extrusion kit for Ender 5 S1.
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Service tutorial Ender - 5 S1 needle cleaning and nozzle replacement - https://www.youtube.com/watch?v=chBmKIPoX6w
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Service tutorial Ender - 5 S1 Disassembly and Assembly of Extrusion Kit - https://www.youtube.com/watch?v=p4bhH7mFdnQ

