My Ender 3 is failing again

My Ender 3 (yes, I know) is messing up prints again. I think the toolhead is damaged.​

One of the failed prints, a dice box for my D&D dice

The printer came with a replacement, but in the 2+ years we've had the printer it's gone missing. I'm going to study how to change the toolhead, and hopefully by the time I know what to do with it we'll have found it.