Originally posted by Gil80
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60ml coffee out is double
It appears you are trying to compensate for the water retained in the puck. Don't bother, just concentrate on the volume of coffee out (not water out of the brew head). The actual volume of water out of the machine will be more as you've seen but don't worry about that - yes it will vary a tiny amount with different coffee types but you can recalibrate if needed.
Its common these days to use a double basket (20g) to pull a single shot and a triple basket to pull double shots, so its a bit confusing. Also confusing is weighing the shot in the cup, so even though you are measuring grams, most people talk ml and assume 1ml = 1g (which is true for water and as coffee is 99.x% water, we'll assume the same conversion).
If making "one drink", then a common recipe is 18-20g coffee with 30 ml output (30g liquid weight in the cup) with a 25-30 second extraction time (time from water touching puck to end - or 20-25 sec for first drop in cup to end). This is not hard and fast but just a starting point. You then need to adjust for taste, as different beans require quite different recipes.


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