SEARCH
Find your next coffee question
Search references, articles, practical guides, roast notes, tools and videos. Start with a few words; use the filters when you want a narrower view.
34 results
From Time to Cup
Total roast time and weight loss are the most reliable way to understand and control roast outcome on the Gene Café CBR-301. This is not because…
One | Roast at a Time | Roasts 51–66 – Multi-Coffee Validation
Overview This set of roasts spans four different coffees and three processing styles: washed, natural, and wet hulled. The purpose was not to refine one coffee…
Roast 47 – Ethiopia Karume (Natural)
Warm Start Personal Roast The second roast of the evening used Ethiopia Karume and was started shortly after the cooling cycle from Roast 46 had completed.…
Brazil Santos – Between Batch Thermal Behaviour (Gene Café CBR-301)
Context One of the practical questions that comes up when roasting multiple batches on the Gene Café CBR-301 is simple: How should the second, third and…
Roast 41 – Colombia Swiss Water Process Decaf
First Decaf Roast on the Gene Café CBR-301 After more than forty roasts on the Gene Café CBR-301, Roast 41 marks the first time decaffeinated coffee…
What the Last 10 Roasts Taught Me About the Gene Café CBR-301
A Pattern Emerging in Roasts 28–38 Over the past ten roasts, something interesting began to appear in the data. At first it felt like the roasts…
Roast 38 – Colombia Regional Jess (Huila, Washed Blend)
Gene Café CBR-301 | First Full Batch Roast After receiving the Regional Jess (Huila, washed blend), the goal of this roast was simple: Produce a clean,…
System Reflection — Thermal Memory on the Gene Café CBR-301 Is Not Subtle
Roasts 32 and 33 were designed as a controlled comparison on the Gene Café CBR-301. Cold start versus warm start.Same Brazil Santos coffee. Same 250g batch…
Sample Roast Comparison – 52g Batches on the Gene Café CBR-301 | Machine Behaviour Study
Why this comparison exists These two roasts were not about flavour discovery. They were a controlled check: Does the Gene Café CBR-301 behave like itself when…
Sample Roast 2 — Costa Rica San Isidro 48 (Red Honey)
Date: 2026-02-09Roaster: Gene Café CBR-301Batch: Sample Roast (low mass) In: 52.5 gOut: 44.3 gWeight loss: 15.6 % 1. Purpose & framing (important) This roast sits squarely…
A few places to start
First crack · Cold and warm starts · Water · Coffee pricing · All articles
For a roast record, try its number, coffee name, origin or process. For orientation, visit Start Here. The Roasting path follows Beginner → Intermediate → Advanced; Understanding Coffee lets you explore subjects in any order.