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PSA: Maybe don't buy these shitty extruders
(m.media-amazon.com)
I spent entirely way too much time trying to get one of these style extruders on my Ender 3. Maybe I picked a knock off without realizing it, maybe mine was just defective, I'm not entirely sure.
But it was ultimately the cause for my printer underextruding on certain layers. If you need a new extruder, go for something better than these cheap $20 ones and get an actually decent one.
But on the bright side, my printer is finally fixed! It feels nice to be able to get back into the hobby again.
Yeah, this is like the 4th time I've had to replace it.
I don't think it's just a matter of print time, I think it's also a matter of how long you've had the machine. I've has mine for I think 4 or 5 years now. The tension arm on the extruder is under constant tension at all times every day. The plastic extruder Ender 3s come with is just not strong enough for the task, so they end up breaking.
I think my second one was basically and identical one made of alluminum. But that one ultimately died as well, for the same reason. So I switched to the above one, which turned out to be a mistake.
So now my 4th one is a CNCed steel dual extruder from micro Swiss. Hopefully it lasts.