Too coarse a grind, too little coffee, or insufficiently tamping the grounds before brewing can all lead to inadequate pressure for a proper brew. 2)It is important to note that the amount of espresso extracted will vary depending on the grind size and amount and reprogramming may be needed when the size and amount are adjusted Add Coarsely Grounded Coffee. Add Hot Water. Wait 4 Minutes. Plunge. Environmentally friendly: No paper filters or plastic capsules required. Base, handle and lid are made of BPA-free polypropylene. Carafe made of German Heat-Resistant Borosilicate Glass. Plunger made of Stainless Steel 34 Ounce Capacity. Dishwasher Safe.