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Roasts 107 & 108: A Cold/Warm Swiss Water Decaf Pair That Stayed Lighter Than Expected
These two roasts were planned as a useful comparison pair. Same coffee.Same machine.Same batch size.Same target temperature.Different start state. The coffee was REDBER Colombia Swiss Water…
Gene Cafe CBR 301 Cold Start vs Warm Start Same Roast Time Very Different Results
This video looks at Gene Cafe CBR 301 Cold Start vs Warm Start Same Roast Time Very Different Results. Same coffee, same batch size, same temperature…
Roast 39 & Roast 40 – Brazil Santos (Cold vs Warm Start Comparison)
Key Metrics Summary MetricRoast 39Roast 40CoffeeBrazil Santos (Wanted)Brazil Santos (Wanted)Batch size250 g250 gVentilationOven hood extractionOven hood extractionStart conditionCold startWarm startStarting temp / ambient20°C75°CTime to 200°C04:2803:13Time to…
Cold vs Warm Start | TRT Discipline | Upper Guardrail Defined
Roast 32 & Roast 33 — Brazil SantosThese two roasts were deliberately paired. The intention was simple:Test repeatability using Total Roast Time (TRT) as the primary…
Roast 36 & 37 – Brazil Santos (Natural) | Cold vs Hot Start Behaviour
🔎 Key Metrics — Roast 36 vs Roast 37 (Brazil Santos, 250g) Roaster: Gene Café CBR-301Ventilation: Oven hood extractor (not directly ducted)Room temp: ~20–21°C 🟢 Roast…
Coffee Roasting Thermodynamics – A Beginner’s Attempt to Understand What Is Actually Happening
Coffee roasting thermodynamics: a beginner’s attempt to understand heat While researching the move from my Gene Café CBR-301 to the Kaleido M2, I kept coming across…
Gene Cafe CBR 301 300g Roast Test Went Wrong
This video looks at Gene Cafe CBR 301 300g Roast Test Went Wrong. Three roasts, same coffees, same batch size, same machine, one cold start, two…
From Roast 120 to Roast 148: When the Gene Café Project Became a Machine-State Story
The last proper website update was around Roast 120. At that point, the Coffee | One Roast at a Time project was already well beyond the…
Crack Monitoring on the Gene Café CBR-301: A Small Progress Update
A cautious update on my ongoing experiment to use audio, roast data, and manual notes to better understand first crack on the Gene Café CBR-301. It…
Four Personal Roasts: Sweetness, Decaf, and an Awkward Pacas Lesson
Date: 25 May 2026 This was a small personal roasting session on the Gene Café CBR-301, aimed mainly at coffees for pour-over and Fellow Aiden brewing.…
Gene Café CBR-301 300g Roast Test Went Wrong
I had planned a simple 300g consistency test on the Gene Café CBR-301. The idea was to roast three batches back-to-back: Roast 112 — cold start…
How the Gene Café JSON Roast Report Beta Evolved
When I first started using the Gene Café CBR-301 app, one thing stood out immediately. The app gives access to roast data. That matters. Not every…
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First crack · Cold and warm starts · Water · Coffee pricing · All articles
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