Re: Channelling!?
You mentioned that inserting the portafilter with a tamped load , then removing it without brewing shows the ground coffee pushed up the sides of the basket 2-3mm.
Sounds to me like an updosed basket that the showerscreen compresses and disrupts the grinds, fracturing the tamped load and leading to channeling.
what shape is the Sunbeam showerscreen ? Convex or concave ?
You mentioned that inserting the portafilter with a tamped load , then removing it without brewing shows the ground coffee pushed up the sides of the basket 2-3mm.
Sounds to me like an updosed basket that the showerscreen compresses and disrupts the grinds, fracturing the tamped load and leading to channeling.
what shape is the Sunbeam showerscreen ? Convex or concave ?

Ive tried Staub tamps, double/settling tamps, normal tamps (with a correctly fitted tamper), and different dosing levels. But alas, still no luck
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