Two questions. First, your table must be perfectly level. I got 67 grams of coffee from one cup and 83 grams from another. My work surface was a bit out of level. Second, spouts only work on fairly small coffee cups. The two mugs I used were too big (one of them was an Ember coffee mug). I ended up using two styrofoam cups and then pouring the contents into coffee cups. I'm disappointed. If the spouts were half an inch higher I'd be in good shape.
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