It sure would be nice if products were made to never wear down but this is an ignorant mindset. With this technology, one of the components that is going to wear down over time is the burr (or burrs, more specifically). To provide you with a better understanding of when your model’s burrs need replacing, here are some dead giveaways. If you notice that their edges feel dull and that you need to grind the beans finer than you normally do, they need replacing. Along the same line, if the grounds are starting to come out as clumps and are inconsistent each time you brew then the burrs shelf life is up.