>>2942245
nozzles are cheap as shit the problem is finding them in a less than 20 pack. you know $6 for one or $15 for 20 is a hard choice. a dirty nozzle, specifically overheated burn on carbon, can be taken care of with a cold nylon pull. to invest in nylon over a new nozzle is a questionable choice. a worn nozzle should be visible under magnification. a clogged nozzle (the former) results in angle hair rats nest with very thin strands (underextrude)

not sure if this is your exact extruder but you should be able to observe it slipping if you remove a cover. you could also ensure everything is tight and not sloppy and either add pressure to the lever release when it stalls or stretch the spring to provide extra tension. observed the gear to ensure it's not clogged with stripped off material too (the feed stalls and the gear grinds out a crescent in the filament and is then clogged and slips).

alternatively you could be losing heat in the hot end like a loose wire shifts mid print you hot end cools the filament just stops. taking everything apart and cleaning, checking wires and observing are all free. a 2nd ender 3 for parts might be free too if you look around.

also you can just try it again with a hotter nozzle and see, it might have been a fluke take pictures next time so we can see the fails. sometimes something like a bed shift will destroy a print in a similar way, visual cues are crucial.