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Nah, no option for pre-infusion with the shades PID. Seen some talk about adding a dimmer switch on the supply to the pump, but it seems a faff/dodgy.
I’ve always wondered, would hitting the brew switch for 3 seconds or so to get some water in, waiting for 10 seconds, then starting the shot properly work as a pre-infusion?
Nef
youClown
Turkish
Agreed that looks like it needs a finer grind; how much espresso did you get in those 27s? Seemed like a lot. Don't think it'd be the tamping that's the issue. You sometimes can get less channelling if you pre-infuse (I think the Mr Shades PID - which I recall you have? - has that functionality?) because the puck is given some time to expand evenly before being hit with the full 9bars of pressure. I might disagree with @jonny69 and think that WDT is probably the best thing you can do to distribute and break up clumps, and I think the leveller is pretty efficient to use if you've got it (does the same thing as tapping against the palm but faster). Although I never bothered with either myself because the Sette made fluffy grinds and I preferred to live with the occasional spurt out than increase prep time by 30s per coffee/get all the extra tools.