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I don't think so, never looked into it properly but I assume the wetness of the puck correlates to the amount of headspace between the puck & shower head. There are definitely some more informed folks on here though who may be able to provide some more info.
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No.
Crema is pointless, don’t worry about it.
As for wet pucks, it’s no biggie. This is often a sign of a blockage in the solenoid as it’s not drawing enough water away when it vents. But it’s also a sign that you are extracting a good amount of solids. Super dry pucks probably aren’t fully saturated.
Re: scales.
If you want to be consistent using scales is a must. You can learn to eye ball it but the 10000hrs rule applies as there are so many variables at play, scales are easier.
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I've heard that crema isn't a good indicator of much. Good shots can have thin crema apparently
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mmccarthy
Matisse
neu
@Light_EDDed
I’ve had a few espresso today and the portafilter is quite wet in side. The coffee tastes pretty good but the crema is a bit bubble.
Is this wrong in some way