Project benchmark

AtFAB 5-30 Minute Chair

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The prompt

Version 1.0

A CAIBI adaptation of this project’s build brief. Use the same version when comparing results.

CAIBI project benchmark: AtFAB 5-30 Minute Chair
Prompt version 1.0

Help me build AtFAB 5-30 Minute Chair using the existing creator project at https://filson-rohrbacher.com/work/atfab. This is a CAIBI benchmark adaptation of the project build brief, not a claim about how the creator used AI.

Project context:
- An open-source CNC plywood chair that turns a downloadable cut file, one sheet of material and basic fasteners into full-size furniture.
- Build context: One sheet of 4×8 ft × 3/4 in (approximately 1200×2400×19 mm) sheet material for the chair and test pieces, as specified in the fabrication chapter; Approximately 30 fasteners; Optional finish such as paint, stain or clear coat.
- Where AI helps: Explain the supplied 2D/3D files and the source build sequence, Help calculate scale compensation from measured sheet thickness, Help map source geometry into a CAM plan and cutting order, Suggest non-structural customisation and finishing options, Troubleshoot fit observations after the test piece is cut.
- Physical work: Choose suitable sheet material and measure its real thickness, Prepare and safely operate a large-format CNC router, Cut and evaluate the source test piece before the chair, Approve feeds, speeds, workholding and toolpaths, Machine the full sheet, Sand, finish and assemble the chair, Inspect joint fit and the finished chair before loading it.
- Main limitation: Plywood thickness and CNC tolerances control whether the joints actually fit. The source deliberately uses a measured test piece before the full cut. A visually plausible AI-generated edit can break joinery, ergonomics or load paths, so structural changes need physical prototyping and judgement.

Read the source first. Use its published design, files, dimensions and parts as the baseline; do not redesign it unless a missing detail requires a clearly labelled proposal. If you cannot access a source or verify a revision, say so.

Provide one practical build package:
1. Design and files: explain the source design, link the original editable files, and identify missing files or modifications.
2. Parts and fabrication: give quantities, exact variants and compatibility, plus a cutting or printing list where applicable. Preserve source dimensions; flag anything unconfirmed.
3. UK and US purchasing: direct product links, checked dates, stock, pack sizes, taxes, delivery and regional costs. Mark unverifiable details as unknown; do not invent links, prices or availability.
4. Assembly: an ordered guide covering fabrication, fitting, wiring or software as applicable, setup, checks and troubleshooting.
5. Cost and time: separate parts, fabrication, delivery, hands-on time and machine time, with assumptions and exclusions.
6. Function and ease: a test plan for the project's stated purpose, likely difficulties, required skills and any corrections or limitations.

Keep source facts, your proposals and items needing physical verification distinct. An estimate is not a measured build result. Do not claim to have built or tested hardware. Include failed attempts and omissions. If a section does not apply, say why.

Use the source as accessed during this run and record its revision or access date. The prompt is fixed; the linked source can change.

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Keep the full response and files. Estimates stay separate from physical test results.

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