Cuprajake i like the idea, but so far what ive seen i dont like, purely because you have excess liquid come which you then have to account for,
I think this is worthy of pursuit.
Sure, releasing the pressure in the group head via the left paddle is a big plus for me because I like to:
a) to remove the portafilter
b) empty the grounds into the knock box
c) rinse the basket
d) wipe the shower screen clean and
e) replace the portafilter in the group head before I
f) enjoy the espresso, feeling secure in the knowledge that the Nurri is spotless
All of that without one drip of espresso from post pour hitting the drip tray. That’s just my OCD coming out of course but still, it cuts down on my psychiatry sessions 😀
BUT … if the group head pressure could be relieved without the release of water from the group head that would be even better. Maybe that is what Dave is working on with Paolo? Or maybe that’s simply not possible given the design of levers.
Because of Jake’s helpful persistence in making his point, I measured the amount of water that is discharged in one use of the left paddle. Each use of the left paddle releases 49mm of hot water into the drip tray. Do that three times a day and we’re up to almost 150ml of water in the drip tray that could have been in the boiler still. That close to a litre over a week. From my side, that’s worth it to be able to complete steps a - f above but if I could do it without wasting that water, that would certainly be better.
BTW this morning I paid closer attention to the volume of espresso that flowed into the cup after I nudged the left paddle: 9 grams. So I need to use the paddle at 26 grams to end up with 36 grams in the cup. (Delicious it was too, thanks for asking).