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I have 8 Ender 3's, all pretty close in age, I have upgraded several with Aluminum Bowden Extruders. Those I have not, are starting to have issues with extrusion as seen in the pictures. Save yourself some frustration and swap it out early.

Here is my guide:
https://makersteve.com/2019/03/19/a-tale-of-eight-enders-aluminum-extruder-upgrade/