Methodology, Approach, and Guardrails
Sample Roasts are very small batch roasts (typically 30–60 g) carried out on the Gene Café CBR-301 to observe machine behaviour at low bean mass.
They exist to answer a narrow question:
Can the Gene Café meaningfully roast very small batches, and what changes in behaviour emerge when it does?
They are not intended to evaluate coffee quality, determine ideal roast levels, or replace standard-batch roasting.
Why Sample Roasts Exist
In professional contexts, sample roasts are often used to:
- Inspect green coffee quality
- Detect defects
- Gain early directional insight
On the Gene Café, the motivation is different.
Sample Roasts here are used to:
- Observe airflow, heat application, and momentum at very low mass
- Understand how first crack audibility changes
- Explore whether colour, aroma, and timing remain usable signals
- Test the limits of repeatability on a consumer drum roaster
They are system experiments, not coffee evaluations.
Batch Size and Setup
- Typical batch size: 30–60 g
- Roaster: Gene Café CBR-301
- Temperature: unchanged from standard roasts
- Preheating: not used
- Airflow: standard system behaviour; no special intervention
The goal is to change only mass, not the rest of the system.
How Sample Roasts Are Read
Because of the low thermal mass:
- First crack may be very quiet, early, late, or absent
- Development happens faster and less evenly
- Weight-loss percentages are directional only
- Small timing differences can have outsized effects
As a result, crack sound is treated as secondary.
Primary signals are:
- Colour progression
- Aroma changes
- Rate of visible development
- Overall roast momentum
Decisions are conservative and observation-led.
Guardrails and Limitations
Sample Roasts intentionally carry strong constraints:
- They are non-repeatable by design
- Results should not be compared directly to full-batch roasts
- They should not be used to judge coffee quality
- They should never inform Lazy Mode defaults or the Guide
A good Sample Roast answers a machine question, not a flavour question.
How They Appear in Notes
Sample Roasts are recorded as Notes only, using a separate numbering sequence:
Sample Roast # — Coffee — Context
They are:
- Clearly labelled as exploratory
- Isolated from main roast numbering
- Referenced only where relevant
They exist to inform understanding, not to stand on their own.
How They May Be Used Later
Over time, multiple Sample Roasts may:
- Support Reflection / System videos
- Clarify how the Gene Café behaves at low mass
- Reinforce why standard batch sizes exist
Any broader conclusions must be earned across many observations, not assumed from a single sample.
In short
Sample Roasts are a tool for curiosity, limits, and understanding.
They are not shortcuts.
They are not profiles.
They are not promises.
They are simply one more way to learn — carefully, honestly, and in context.