Built around a newly patented pumping system . the Nanopresso is capable of reaching . with the help of your hands . a maximum of 18 bars [261 PSl] of pressure for unparalleled coffee extractions qualities. The Nanopresso works best with finely ground coffee that is tamped hard. lt is delightfully easy to operate and simple to use. The Nanopresso requires 15% less force to pump compared to previous models (1st generation Minipresso]. With Nanopresso . the power is in the machine.not in your hands. After each shot . Nanopresso maintenance takes only a few seconds. When necessary . every component of the portafilter is easily separated for deep cleaning.