Less bitter coffee
Choose sweetness and a clean finish rather than harsh dark roast flavour.
Coffee machines
An automatic coffee machine can only be as good as the beans you put into it. Choose coffee with sweetness, moderate acidity and low bitterness.
Short answer
The best beans for automatic machines are usually balanced, clean and not too oily. For Kapalaj, that often means Guatemalan coffee with chocolate, caramel, nuts or mild fruit.
Choose sweetness and a clean finish rather than harsh dark roast flavour.
Round profiles work well for black coffee and americano.
Grind coarser if bitter, finer if the cup tastes thin.
Balanced beans with sweetness, body and low burnt bitterness usually work best.
Common causes are too fine a grind, too high strength, very dark beans or equipment that needs cleaning.
Yes, but start with an approachable profile before choosing very fruity or experimental beans.