Lattice

What the source does

• FilesystemNone observedNo reads or writes in the source
• NetworkNone observedNo outbound calls in the source
• ShellNone observedNo commands run in the source
• DependenciesPinnedNothing floats
• SecretsNone foundNo keys in source

Five audit layers

Gates applied: no behavioural pass.

Audit 0.4.1 · source sha 24034f36bad7 · 19 Oct 2026Report an issue or request a re-scan

• Publisherghbalf GitHub userOwner of the repository this skill is read from
• Source folderghbalf/freecad-ai/skills/latticeThe exact folder we audited
• LicenceLGPL-2.1As the repository states it
• Commit pinned for this verdict24034f36bad7A new audit runs when the source changes
• Repository statusNot archivedLast push 2 days ago
• Sandboxed runNot runSkills are read, not executed; layer L4 is skipped

Its description: Generate a 3D lattice or infill pattern inside a bounding region. Useful for lightweight structural parts.

---
name: lattice
description: "Generate a 3D lattice or infill pattern inside a bounding region. Useful for lightweight structural parts."
---

# Lattice / Infill Pattern

Generate a 3D lattice or infill pattern inside a bounding region. Useful for lightweight structural parts.

## Pattern types
- **Grid**: rectangular grid of holes or beams
- **Honeycomb**: hexagonal pattern (strongest weight-to-strength ratio)
- **Diagonal**: 45-degree crosshatch
- **Gyroid** (advanced): triply periodic minimal surface

## Parameters to ask (if not provided)
- **Pattern type**: grid / honeycomb / diagonal
- **Region**: existing object to fill, or bounding box dimensions
- **Cell size**: distance between pattern centers (default 10mm)
- **Wall thickness**: thickness of lattice walls/beams (default 1.5mm)
- **Height/depth**: extrusion height of the pattern

## Construction approach

### Grid pattern
1. Create a sketch with a rectangular array of circles or squares
2. Use spacing = cell_size, hole diameter = cell_size - wall_thickness
3. Pad to height, then boolean-intersect with the bounding shape

### Honeycomb
1. Create hexagonal cells: 6 line segments per cell
2. Hex radius = cell_size / 2
3. Offset rows by cell_size * 0.75 horizontally and cell_size * sqrt(3)/2 vertically
4. Pad and intersect with bounding shape

### Diagonal crosshatch
1. Create parallel lines at 45 degrees, spaced by cell_size
2. Create second set at -45 degrees
3. Lines have width = wall_thickness
4. Pad and intersect

## Important
- Always create the lattice larger than the target region, then use boolean intersection to trim
- Label clearly: "Lattice Grid 10mm" etc.
- For 3D printing, ensure wall_thickness >= 2x nozzle diameter (typically >= 0.8mm)
- After construction, hide all sketches for a clean viewport:
```python
for obj in App.ActiveDocument.Objects:
    if obj.TypeId == "Sketcher::SketchObject":
        obj.Visibility = False
```

Excerpt, first 1,930 characters of SKILL.md, verbatim from the audited commit. It is text from someone else’s repository, quoted so you can judge it before your agent reads it.

git clone https://github.com/ghbalf/freecad-ai
git -C freecad-ai checkout 24034f36bad7

Works in

1. 2026-10-19
   ✓SAFE B 89 / 100

   first audit · source 24034f36bad7

Questions about Lattice

• github.com/ghbalf/freecad-ai/tree/master/skills/lattice — the audited source at commit 24034f36bad7 and every finding aboveObserved · 19 Oct 2026

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