Peppersass wrote:My own experience suggests that tamping pressure has little or no effect on the extraction.
"Regardless of what actually happens, I think there's no need to obsess over tamping pressure. If there's any effect, its minimal."
"There seems to be some anecdotal evidence that tamper shape and size might make a difference."
"Finally, the Socratic study is based on extraction yield measurements. I'm a proponent of using such measurements for various purposes, like dialing in, ensuring consistency, troubleshooting equipment, etc., but it's not a given that a higher extraction yield is always better.
Thanks for the detailed answer, which I edited to show only some highlights. I might think if pressure matters not, hard to see how tamper shape might matter. Socrates compared 4-5 nice tampers, but all were flat. Elsewhere, here on the site, there seems to be data that shape matters not, which would be no surprise.
To me, the take home message from the data is, not that there is more effect on TDS, not less effect on TDS of tampers or tamping, but: NO MEASURABLE SIGNIFICANT DIFFERENCES.
Maybe, until proven otherwise with data:
"Make everything as simple as possible, but not simpler."