I've only got a porlex at the moment
The Porlex works more consistently at finer grinds, so try a step finer, and tamp lighter. Keep everything nice and level when you tamp. You can feel the edges of the basket as a guide to how level you are pressing.
@rodabod started
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The Porlex works more consistently at finer grinds, so try a step finer, and tamp lighter. Keep everything nice and level when you tamp. You can feel the edges of the basket as a guide to how level you are pressing.