You may be able to repair or replace certain parts of a coffee grinder if they stop working, including the following:
Burrs: The burrs of the coffee grinder can wear out over time. Most coffee grinders allow you to easily replace the burrs.
Blade: A blade can wear out over time, becoming dull, meaning it doesn't grind or chop the beans as well.
Grounds tray: The grounds tray can wear out, or become chipped over time, especially if it's made with cheap materials.
Hopper lid: You may need to replace the lid if it begins to chip or peel.
Timer switch: The timer switch lets you know when the grinding is complete. The timer switch can wear out with frequent use.
Grinder funnel: The grinder funnel can peel, chip, or burn over time, and may need to be replaced.
Resting fork: The resting fork holds the filter in place. Some coffee grinders come with a spare resting fork.
Burr holder: A burr holder holds the burrs in place. The burr holder is affordable and easy to replace.
Learning how to use a coffee grinder can help to maintain its quality over time. Some parts may need to be replaced frequently, but others may last longer with frequent upkeep.