Makita DCM501Z is compatible with 60mm single-serve packs, which are flat and look like a coffee bag. You can't put K-cup in it, it's not compatible. Some users have tried the Douwe Egberts Senseo pods and worked well. However, not many companies are making this type of coffee pod. You can use your favorite ground coffee, since it comes with a measuring spoon, permanent filter, and no paper filters needed.