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Re:A vintage 1903 espresso machine at a Village cafe by nikau on Monday May 27, 2024 @01:28AM (#40487832)
E61 is a partucular group head design, it provides temperature consistency and a form of pre infusion.

Lots of commercially machines like slayer have a portafilter but that's where the similarity ends.

Re:A vintage 1903 espresso machine at a Village cafe by alfiedotwtf on Wednesday May 29, 2024 @05:23PM (#40517188)
And to add… most cafes in Australia (at least the ones I’ve ever been to) all use e61. Maybe something to do with La Marzocco having an almost-monopoly here