Show HN: I designed an espresso machine and coffee grinder

Original Article ↗ Hacker News Discussion ↗

Overall reception

  • Many are impressed by the ambition and aesthetics of a solo hardware project; the grinder especially draws praise as “functional art.”
  • Others are cautious or skeptical, mainly due to missing practical details, lack of independent reviews, and unusual design choices.

Grinder (Turbina) and cylindrical burrs

  • Novel cylindrical burr design is seen as the most interesting innovation.
  • OP explains: adjustment is like conical/flat but requires ~19x more movement for the same change, claiming better repeatability; design emphasizes “densification” and a long grinding path.
  • Concerns:
    • Lack of particle-size distribution data, retention measurements, and taste comparisons vs well-known grinders.
    • Burrs currently not well-suited to very dark/oily roasts; light/medium roasts are the focus.
    • Need to understand noise level, grind speed (45s per dose seems slow to some), and long‑term availability of proprietary burr replacements.

Espresso machine (Trefolo) and pump

  • Core idea: no internal boiler; user supplies hot water (typically from a kettle) through a tube, machine provides pump, pressure control, and grouphead.
  • Uses a compact brushless gear pump; also sold as a retrofit kit for existing machines.
  • Debates:
    • Thermal stability and temperature control through a long plastic/silicone tube are questioned, especially for light-roast espresso.
    • Some see it as “half an espresso machine” without heating/steam; others like the modularity and reuse of existing kettles.
    • External water tube and power brick are seen as visually awkward and potentially inconvenient.

Price and market positioning

  • $649 machine and ~$700 grinder are viewed as:
    • High or outrageous by non‑enthusiasts.
    • Reasonable to cheap by espresso hobbyists, compared to multi‑thousand‑dollar setups.

Website, media, and communication

  • Strong recurring criticism:
    • Over-stylized close-ups, parallax video, and lack of full, static photos on a real countertop.
    • No clear depiction of where the tubes go, how the workflow actually looks, or what all is included (pump brick, water source, drip solution).
    • Some links/labels (old “Oculo” name) and typos are noted.
  • Many insist on:
    • Simple, non‑staged workflow videos (bean to cup, including kettle, cables, tubes).
    • Independent reviews by known coffee reviewers before preordering.

Trust, support, and sustainability

  • Requests for:
    • Clearer company identity, location, warranty, spare parts catalog, and long‑term support commitments.
    • Design registration/patents to prevent copying while not blocking enthusiasts.
  • Some worry about manufacturing difficulty and past espresso hardware vaporware; others note OP’s engineering background and detailed participation as reassuring but still want proof via shipped units and third‑party tests.