The primary cause is a build-up in pressure. A Keurig, for example, has two needles that puncture the coffee pods. One from the top and one from the bottom. If the bottom needle has become severely clogged, or the opening is narrowed, the pressure will build up in the pod – potentially causing an explosion.

How do you keep K-Cups from exploding?

If you make coffee with the use of K-Cups at an altitude that’s higher than 6,000 feet, this can cause pressure to build inside them to the extent that they explode. To prevent this from happening, puncture the K-Cups with a small pin before you brew coffee with them to relieve some of the pressure.

Why does my Keurig leaving coffee grounds in my cup?

Generally, when brewing with a Keurig® coffee maker, this is caused by grinds or tea clogging the exit needle. … This situation occurs more often with teas, Cafe Escapes and when using the My K-Cup® but, can happen on occasion with a good old-fashioned K-Cup® pod.