Iterate printable mechanical parts through a CAD macro

Why use this

1. A designer iterating printable mechanical parts may get plausible rendered geometry while clearances, mounting interfaces or motion assumptions remain unresolved. A visually appealing model does not demonstrate that a physical assembly will fit or operate safely.

2. A dimension-and-review manifest could connect each requested change to the intended interface and required human checks. It would keep geometry iteration separate from printing, powered testing and any conclusion about mechanical suitability.

Why an agent / simpler alternative

Useful judgment

Translate explicit geometric requirements into a proposed revision plan and expose conflicting dimensions.

Simpler alternative

Edit a familiar CAD model directly when changes are few and constraints are clear.

Unsuitable when

The part is safety-critical or loads, tolerances and operating conditions lack qualified review.

Proposed inputs

1. Name

   Part and interface brief

   Owner

   Engineer

   Minimum scope

   Intended benign use, dimensions, mating parts and allowed changes

   Quality check

   Identify critical interfaces and unresolved tolerances.

2. Name

   Existing CAD context

   Owner

   Designer

   Minimum scope

   Approved geometry snapshot, units and export requirements

   Quality check

   Preserve the original design and note the target tool/version.

Access and setup — proposed or unknown

Proposed minimum

1. Offline geometry-change specification and private review checklist; no CAD execution or hardware control.

Compatibility unknowns

1. Unknown: exact runtime, FreeCAD/macro compatibility, export behavior and printer/material suitability.

External actions requiring approval

1. Running macros, replacing design files, printing parts or operating an assembled mechanism.

Expected deliverable and review checks

Proposed artifact

Proposed CAD revisions and export-review manifest with dimensional, fit and safety questions.

Critical checks

1. Every critical dimension and unit has an explicit source.

2. Rendered appearance, printable export and mechanical fitness remain separate validation steps.

Missing output evidence

No new workflow run or output inspection was performed for this overlay.

Failure signals and proposed responses

1. Signal

   A revision changes a mating interface while improving exterior shape.

   Why it matters

   The part may no longer fit the intended assembly.

   Proposed response

   Flag the interface change and require engineer confirmation.

2. Signal

   A clearance is omitted because components do not visibly intersect in the model.

   Why it matters

   A static view may conceal motion or fabrication constraints.

   Proposed response

   Keep physical fit and motion unresolved pending qualified review.

Effort and cost — unknown

Setup work

1. Define interfaces and preserve a versioned baseline.

Ongoing review

1. Have engineers inspect geometry and separately authorize fabrication trials.

Unknowns

1. Unknown: tolerance adequacy, print cost, material behavior and mechanical safety.

First check — proposed, unexecuted

Status

proposed_unexecuted

Synthetic fixture

An invented revision manifest mixes units and changes a mounting dimension without approval.

Acceptance checks

1. Both inconsistencies block proposed export readiness.

2. No geometry, fit or safety validation is claimed.

Stop conditions

1. CAD execution, physical fabrication or engineering judgment is required.

Limits

1. Editorial mechanical-design planning; a synthetic manifest check is not CAD, tolerance or hardware validation.