This page collects the roast notes from 2026 — the main working record of Coffee | One Roast at a Time.
These are not recipes or instructions. They are learning records from real roasts on a Gene Café CBR-301, written at the time of the roast. The most useful numbers in any note are usually batch size, start temperature, total roast time (TRT), weight loss, and cup result where recorded.
A heater repair occurred mid-project. Roasts from Roast 70 onward reflect a period of post-repair recalibration — the machine behaves differently and earlier assumptions needed revisiting.
Start here within the notes
- Roast 91 and 92 — Same Plan, Different Result — the most recent summary of where things stand
- Roast 70–75 — The Repaired Gene Café Has a Different Fingerprint — post-repair behaviour explained
- Roast 36 & 37 — the cold vs warm start comparison, the most referenced result in the archive
- Roast 8 — Brazil Topazio — the upper-bound reference roast used for comparison throughout
All 2026 notes
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Roast 93 and 94 – End-of-Bag Personal Roasts
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Roast 91 and Roast 92 — Same Plan, Different Result
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Roasts 84 to 91 – Stabilising the Current Heater, Not Pretending It Is Normal
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Roast 80–83 – Control Inputs vs Outcome (Honduras, Washed)
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Post-Heater Recalibration, What Actually Changed
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Roast 70–75, The Repaired Gene Café Has a Different Fingerprint
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Roast 74 and 75, Honduras Calibration Pair After Repair
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Post-Repair Recalibration, Where Things Stand After Four Roasts
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Roast Interruption – Gene Café CBR-301 (E4 Error)
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One | Roast at a Time | Note – Roaster Failure (Mid-Project)