There are two screen sizes: 1-2 cups 3-4 cups. Per cup I expect 5 cents for espresso powder. That may now compare each even with the prices that are incurred for. As for Nespresso capsules. From the resulting aluminum waste not to mention.
The preparation is easy. The device is first screwed into the center apart. In the lower container is filled a much water as you need cups. In the container is a practical scale for the number of cups is (50 ml per cup). Then use the screen, possibly with reduction for a smaller amount. The screen filled with loose ground coffee. Important: Do not stomp, just fill. Now the top of the digester on screws and pull the switches. After 3-5 minutes the water has run through and the unit switches itself off. During the waiting period, it is advisable, before preheat the cups. I befülle for the purpose half with water, place all together in the oven and let the water boil briefly. Finally tilt away the hot water, pour espresso and enjoy.