DiyPresso: DIY Espresso Machine

Original Article ↗ Hacker News Discussion ↗

Product & Design Reactions

  • Many find the diyPresso concept “cool” and unusually polished for an open-source / hacker kit.
  • It’s a single‑boiler, E61-group, vibratory-pump machine, assembled from a boxed kit, with Arduino‑class control and open firmware on GitHub.
  • Some question calling it “DIY”: it’s more “some assembly required” than scratch‑built hardware.

Open Source, Gaggiuino, and Ecosystem Context

  • Several comments frame diyPresso as arriving just after a popular open espresso mod project went closed‑source and tied itself to approved hardware vendors.
  • That earlier project’s relicensing and anti‑commercial stance are seen by many as overreaction and a misunderstanding of open licensing.
  • diyPresso’s repo initially lacked a license but then added one; people are watching closely for how “open” it stays.

Price, Value, and Target User

  • Kit price (~€1,250) is viewed by some as “crazy” for a DIY build; others note this is low‑end for midrange E61 home machines.
  • Critics argue a ~€250 consumer machine plus good technique may be “good enough” and that diminishing returns above that are steep.
  • Supporters counter that higher‑end machines buy consistency, temperature stability, and workflow, not just marginal taste.
  • Several say this targets a niche: tinkerers who want to build a serious machine more than they want the cheapest path to espresso.

Technical Design Debates

  • E61 group choice is contentious:
    • Pro: parts are standardized, easy to source, and well understood.
    • Con: heavy thermal mass, long warm‑up, temperature surfing, and “ancient” design not ideal for modern home use.
  • Vibratory pumps are defended as perfectly capable of pressure profiling (citing existing machines and mods).
  • Some wish for rotary pumps or more modern groupheads but acknowledge cost and complexity tradeoffs.
  • Voltage/region support is unclear; at least one commenter assumes it’s 230 V–focused.

Safety & Firmware Concerns

  • One commenter who read the firmware worries about heater control being tied to the main loop and potentially failing “on” during Wi‑Fi / MQTT issues.
  • Others point out mechanical safeties: thermal thermostat on the boiler, overpressure valve, but note lack of true “run‑dry” protection and limited safety documentation.
  • Several stress that high‑pressure, high‑temperature DIY hardware needs explicit, well‑explained safety features.

Alternatives & Broader Espresso Philosophy

  • Many advocate alternative paths:
    • Retrofitting existing machines (e.g., with third‑party controllers, PIDs, pressure profiling).
    • Lever and manual machines (Flair, Cafelat Robot, La Pavoni, Olympia) for simplicity, longevity, and off‑grid use.
    • Super‑automatics or Nespresso‑style pods for convenience, though pods spark environmental and taste arguments.
  • Several emphasize that grinder quality, fresh beans, and puck prep matter more than the specific machine once basic pressure/temperature needs are met.