Whitepapers
In-depth technical documentation exploring the science, design rationale, and methodology behind each Brew Supply tool. Built for competitors, coffee scientists, and serious home brewers.
Browse All Whitepapers
AeroBox
Precision Press Stand for Quantitative AeroPress Brewing
AeroStop
Mechanical Press Endpoint Control for More Repeatable AeroPress Brewing
BeanSieve
Size-Based Bean Sorting for More Intentional Roast and Brew Comparisons
AeroSweep
Chaff and Fines Reduction Tray for Cleaner AeroPress Preparation
More whitepapers coming soon
As we develop new tools, their technical documentation will appear here
Whitepaper Summaries
Condensed overviews of each whitepaper's core premise, key claims, and chapter structure.
AeroBox
Precision Press Stand for Quantitative AeroPress Brewing
Abstract
This white paper introduces AeroBox, an open-source, 3D-printable AeroPress press stand designed to enable quantitative control of the press phase by stabilizing the brewer and supporting scale-based measurement of total press output (grams-out) and press flow rate (g/s).
Key Claims
Controlling a measurable endpoint (grams-out) reduces brew-to-brew variability relative to hiss-based stopping.
Flow-rate feedback reduces press surges and improves press profile consistency.
Avoiding late-stage pressing into the hiss regime reduces the risk of bitterness/astringency events.
A stable press stand enables these controls by reducing station movement during plunging.
Chapters Overview
Background and Context
AeroPress extraction involves immersion, filtration, and pressure-assisted flow. The press phase changes extraction and beverage composition depending on execution.
Problem Definition
The press phase is controlled by qualitative cues ('press gently', 'stop at hiss') rather than measurable targets, leading to inconsistent outcomes.
Mechanism
Late-stage pressing can spike bitterness due to two-phase flow transition, pressure increases, and fines migration at the 'hiss' boundary.
Design Goals
Convert 'press vibes' into measurable control: total press output (g) and press flow rate (g/s) as quantitative targets.
System Overview
AeroBox is a measurement-enabling press platform combining mechanical stabilization with scale-based mass and flow signals.
AeroStop
Mechanical Press Endpoint Control for More Repeatable AeroPress Brewing
Abstract
This white paper defines the AeroPress press endpoint as a controllable recipe variable and presents AeroStop as a compact physical stop that makes that endpoint repeatable and adjustable.
Key Claims
A physical stop can reduce variability at the end of the press compared with guessing when to stop.
Endpoint height can be held constant during testing or adjusted deliberately as part of the recipe.
Early testing supports careful claims about more repeatable beverage output, not full extraction control.
AeroStop prioritizes compactness and travel readiness for competition kits, travel brewing, and low-friction practice.
Chapters Overview
Problem Definition
Why end-of-press control is difficult when brewers rely on feel, timing, and audible cues such as the hiss.
Endpoint Control
How the press endpoint differs from hiss avoidance and why that distinction matters for beverage output and flavor.
System Design
How the 18 mm base and 2 mm boosters define different fixed press endpoints and starting calibrations.
Dial-In and Evidence
How endpoint height can be used as a recipe variable, what early testing supports, and how community logging should work.
BeanSieve
Size-Based Bean Sorting for More Intentional Roast and Brew Comparisons
Abstract
This white paper defines roasted whole-bean size profile before grinding as a controllable competition variable and presents BeanSieve as an open-source workflow for matched dose composition from limited samples.
Key Claims
A weighed dose is not always the same physical dose, and BeanSieve makes that hidden size composition measurable.
Removing only below-range broken material and recomposing the retained profile preserves more coffee than aggressive sorting while improving repeatability.
Size-profile matched dosing lets brewers compare recipe changes against a more stable whole-bean baseline.
BeanSieve supports cleaner experiments and narrower claims about repeatability, not guaranteed sensory outcomes.
Chapters Overview
Problem Definition
A weighed dose can still vary physically because the whole-bean size composition entering the grinder is not necessarily constant.
Size-Profile Control
BeanSieve reframes roasted whole-bean size profile as a controllable variable rather than only a defect-sorting concern.
System and Workflow
Eight sizing trays, one bottom catch tray, and a companion calculator support matched dosing and controlled profile experiments.
Evidence and Positioning
The paper defines what established coffee screening supports, what still requires community testing, and where BeanSieve fits among adjacent tools.
AeroSweep
Chaff and Fines Reduction Tray for Cleaner AeroPress Preparation
Abstract
This white paper positions AeroSweep as a workflow tool for wider, more repeatable chaff removal and optional partial fines trapping during the same competition-prep step.
Key Claims
Moving grounds from a narrow catch cup to a wider tray improves the working geometry for airflow-based chaff removal.
AeroSweep Fines adds passive partial fines trapping to a step some brewers already perform for chaff removal.
Repeatable tool choice, shake count, and endpoint cues make preparation-state comparisons easier to test.
Prototype testing supports narrow mechanism claims about fines retention, not universal sensory improvement.
Chapters Overview
Problem Definition
Competition brewers already manipulate chaff and fines, but the workflow is often improvised, cramped, or costly under time pressure.
Separation Geometry
AeroSweep reframes chaff removal as a geometry problem and extends the same handling step into optional fines trapping.
System and Workflow
AeroSweep Chaff and AeroSweep Fines share one tray-based workflow, with the fines version adding a ridged floor for partial fines trapping and optional recovery.
Evidence and Scope
The paper defines the current prototype evidence, the practical limits of the tool, and the use cases where it is worth the added step.