Open Source Espresso Machine Is One Delicious Rabbit Hole Inside Another

In a Substack post, Norm Sohl describes how he built a highly configurable machine out of open source hardware plans and the thermal guts of an Espresso Gaggia. An anonymous reader shares a summary from Ars Technica: Like many home espresso enthusiasts, Sohl had seen that his preferred machine, the Gaggia Classic Pro, could be modified in several ways, including adding a proportional-integral-derivative (PID) controller and other modifications to better control temperature, pressure, and shot vo