FREE INDEPENDENT GUIDE · VERSION 1.0
Gene Café CBR-301 Owner’s Field Guide
The practical guide I wish I had when I started using the CBR-301.
Written by Warren Matthews, this illustrated field guide brings together the official Gene Café manuals and app guidance, direct inspection of the machine, recorded roast data, photographs and the practical lessons learned through repeated home roasting.
It is written for ordinary owners who want to understand the machine without pretending every roast can be reduced to one perfect profile.
Built from evidence, not theatre
Official guidance · Real roasts · Direct observation · Plain English
The guide keeps manufacturer instructions, field observations, working interpretations and open questions separate, so a useful personal observation does not quietly turn into a universal fact.
What the guide covers
Use it as a practical companion beside the roaster, or jump straight to the question you need answered.
Start safely
Setup, ventilation, electrical checks, batch limits, chamber seating and a practical pre-roast checklist.
Understand the controls
What TIME and TEMP do, the 200°C and 230°C prompts, fan and drum settings, and what changes during cooling.
Use the app realistically
Live graphs, manual crack markers, saved profiles, comparisons and JSON exports, without treating the app as a programmed roast controller.
Read the roast
Total roast time, colour, aroma, smoke, first crack, displayed temperature and the limits of each clue.
Cool and clean
The documented cooling cycle, an optional external bean-cooling method, chaff removal, routine cleaning and troubleshooting.
Build repeatability
Reference roasts, roast records, weight-loss calculations, controlled comparisons and closing the learning loop with the cup.
Inside the first edition
Quick navigation
A question-led index and quick-start appendix help you reach the right section without reading all 53 pages first.
Real photographs and diagrams
Machine controls, sensor locations, airflow, app use, cooling, cleaning and examples from actual project roasts.
Useful print resources
A pre-roast checklist, troubleshooting reference, printable roast log, weight-loss guide, glossary and specifications notes.
An independent companion
Use it alongside the official manual
This field guide is independent of Genesis Co., Ltd., Gene Café and their distributors. It does not replace the official safety, electrical, warranty or service instructions supplied with your machine.
Where the guide describes Warren’s own practice, it is presented as owner experience rather than manufacturer instruction.
Version 1.0 · First Edition
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Copyright © 2026 Warren Matthews / Coffee | One Roast at a Time. All rights reserved.