I have been a happy use of Cafejo's My French Press for quite a while. It works by piercing a K-Cup and holding the capsule in place while your applied pressure to push boiling water through the ground beans.
Unfortunately, the needle responsible for the piercing the bottom of my K-Cups started to bend and then eventually broke. Cafejo does not sell the replacement part, and so their solution was for me to purchase another set!
That didn't make sense to me. I have used scissors to cut a hole at the bottom, but I needed a time-saver. So I decided to create this simple yet effective method of making the hole for me to brew my morning dose of caffeine. After piercing a hole at the bottom of your K-cup, carefully fit the cup into the faulty adapter and you are good to brew!
Do try to print this with food-safe material. Also, be sure to examine your K-cups under light, to ensure that the beans are actually retained by filter paper at the top, and there's about a centimetre gap between the bottom of the filter and cup.