manufacturability-validator

name: manufacturability-validator description: Hard engineering validation and auto-correction rules to ensure all generated jewelry geometry is manufacturable and structurally safe.

PURPOSE

This skill enforces manufacturing safety and structural validity.

It runs AFTER geometry generation and BEFORE export.

It has authority to:

• Reject unsafe geometry
• Auto-correct minor violations
• Clamp unsafe parameters
• Block export if necessary

Aesthetic intent never overrides structural integrity.

GLOBAL STRUCTURAL RULES

All geometry must:

• Be manifold
• Be watertight
• Be a single solid body
• Have outward-facing normals
• Contain no self-intersections
• Contain no zero-thickness surfaces

If violation detected: → Attempt auto-repair → If repair fails, block export

MINIMUM WALL THICKNESS

Minimum wall thickness anywhere: 1.0 mm
Recommended structural thickness: 1.2–1.8 mm

If wall thickness < 1.0 mm:

1. Increase local thickness automatically
2. Preserve outer profile when possible
3. Log correction

If < 0.6 mm: → Reject design as structurally unsafe

BAND STRUCTURAL RULES

Minimum band thickness: 1.5 mm
Minimum band width: 1.5 mm

If violated: → Clamp to minimum safe value

Band must maintain continuous curvature. No sharp interior corners (fillet ≥ 0.2 mm).

PRONG VALIDATION RULES

Minimum prong thickness: 0.8 mm
Recommended: 1.0–1.3 mm

Minimum prong height above girdle: 0.5 mm
Minimum prong base fusion depth into band: 0.4 mm

Prongs must:

• Not intersect each other
• Not float disconnected
• Be fused to base geometry
• Have tapered profile (no cylindrical rods)

If prong too thin: → Increase to 0.8 mm minimum → Preserve visual symmetry

If prongs intersect: → Recalculate angular spacing

STONE SEATING VALIDATION

Seat depth must be: 15–25% of stone height.

Seat clearance tolerance: +0.05 mm (manufacturing tolerance) -0.00 mm (no negative interference)

Stone must not:

• Penetrate band bottom
• Float above seat
• Clip through prongs

If interference detected: → Adjust seat depth automatically

BEZEL STRUCTURAL RULES

Minimum bezel wall thickness: 0.8 mm
Minimum bezel lip coverage: 0.3 mm above girdle

Bezel must:

• Fully encircle stone
• Have internal support seat
• Avoid razor-thin edges

If lip too thin: → Increase thickness → Maintain symmetry

SIDE STONE CHANNEL RULES

Minimum spacing between stones: 0.4 mm
Minimum metal between pavé stones: 0.5 mm

If stones overlap: → Reduce diameter slightly → Or reduce count evenly

Never allow:

• Overlapping stone meshes
• Zero-gap configurations

OVERHANG & PRINTABILITY RULES

For 3D printing compatibility:

Maximum unsupported overhang angle: 60°
Minimum support contact area: 0.8 mm²

If unsupported overhang detected: → Add structural support thickening → Or slightly modify curvature

Do not distort primary design silhouette.

MASS & STABILITY CHECK

Compute:

• Center of mass
• Base support footprint

Ring must:

• Balance evenly
• Not tip excessively forward
• Maintain uniform weight distribution

If unstable: → Slightly thicken lower band interior

SHARP EDGE RULE

No external edge sharper than 0.1 mm radius.

All load-bearing junctions must include fillet ≥ 0.2 mm.

If sharp edge detected: → Auto-apply fillet

BOOLEAN & SOLID VALIDATION

After all geometry operations:

1. Validate single solid
2. Remove internal faces
3. Check for duplicate vertices
4. Recalculate normals
5. Confirm watertight STL

If failure: → Attempt rebuild → If still failing, reject export

AUTO-CORRECTION POLICY

Allowed auto-corrections:

• Increase thickness
• Adjust seat depth
• Slightly reduce stone size (≤5%)
• Increase prong thickness
• Add fillets

Not allowed:

• Removing center stone
• Changing ring size drastically
• Downgrading structure without logging
• Silent geometry deletion

All corrections must produce:

{ "violations_detected": [string], "corrections_applied": [string], "manufacturing_status": "SAFE" | "AUTO-CORRECTED" | "REJECTED" }

REJECTION CONDITIONS

Immediately reject if:

• Non-manifold solid cannot be repaired
• Wall thickness < 0.6 mm
• Prongs structurally disconnected
• Stone fully unsupported
• Budget constraints forced unsafe geometry

Return explicit reason.

PERFORMANCE REQUIREMENT

Validation must complete under 300ms for standard ring models.

Validation must not trigger full pipeline rebuild unless required.

PRIORITY ORDER

1. Structural integrity
2. Manufacturability
3. Printability
4. Visual similarity

If trade-off required: → Always favor structural safety.

OBJECTIVE

This validator exists to ensure:

• The 3D model is production-ready
• No manual CAD cleanup is required
• The design can realistically be cast or printed
• The system behaves like a professional jewelry CAD assistant

Safety and manufacturability are non-negotiable.