Yesterday they delivered the new shower screens so I have a double pair to clean out, it seems to be a new design we a little less headspace for the coffee puck so I’ll probably have to lower the dose on the single shot bucket. At the left the new one, and at the right the old one
The exact hight of the new and the old screen from the grouphead are measured by the following method:
old: 15,00 mm; new: 13,60 mm
So we loose 1,4 mm of headspace, this means that we crush the puck before the pre-infusion. And it gives some strange channelling of water on the sides some times.
Maybe this is due to the crushing or something, but this we will need to find out! I will keep you posted.