Scan a CAD assembly for molding problems

Codex inspected a real assembly in local CAD and produced a report of likely injection-molding issues before tooling.

Done with Codex· Intermediate· Oct 2026

What they did
A developer packaged a real geometry review into a reusable Codex Skill. They supplied either a STEP file or a native assembly together with the product’s configuration table, and Codex used local CAD tools to confirm file versioning, units, placement, model soundness, overlaps, gaps, thickness, and important section cuts. It also marked likely molding trouble spots and recorded SHA-256 hashes for the input files.
How it went
The agent returned an editable report that names each problem, where it shows up, how it was measured, what the recheck found, and the condition for closing it. The repo does not carry the original product data or outcomes, so each new case has to be checked again.
Tips
Use the geometry review as an early filter, not as a substitute for mold-flow or shop testing. You still need to provide material, load, and mold-plan details, and the report should say which mold evidence and trial proof are still required.

Try it yourself with Codex

Review [STEP file or native assembly path] with local CAD tools for injection-molding risks before tooling. Use [configuration table] to check file version, units, placement, model soundness, clashes, gaps, thickness, draft, undercuts, sink-prone zones, and parting-line concerns. Produce a severity-ranked report that lists the part name, the check or measurement used, the recheck result, and the condition that would count as fixed. Save the report as [filename], make no edits to the source files, and pause for my approval before any irreversible action such as deleting, sending, submitting, or overwriting files.

Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.

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