3D-print export functionality for `img2threejs` generated models.
Raw Developer Origin & Technical Request
GitHub Issue
Jul 17, 2026
## Motivation
img2threejs output is a procedural `THREE.Group` — great for the browser, but not directly printable. A single "image → printable 3D model" path would open the project to the maker / 3D-printing community.
## Scope
- Bake a generated `THREE.Group` into a single merged, **watertight** `BufferGeometry` and export **STL / OBJ / glTF**.
- Basic print-prep: manifold/normals check, a wall-thickness warning, and scale-to-mm with a target longest-edge.
- Note (honestly) where a single-image reconstruction leaves hidden faces mirrored/approximated — printability depends on it.
## Pointers
- `ROADMAP.md` (v1.4 — glTF export)
- `root.userData.sculptRuntime` exposes the node/collider hierarchy to walk during the bake.
## Acceptance criteria
- `export --format stl` (or equivalent) produces a sliceable STL for the loot-chest demo that loads clean in a slicer.
- A manifold check reports non-watertight geometry instead of silently exporting a broken mesh.
- Documented limits: which subjects print well vs. need manual repair.
**Difficulty:** medium–hard. A great fit for someone who prints — real-world test prints as PRs very welcome.
Developer Debate & Comments
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Adjacent Repository Pain Points
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Engagement Signals
Cross-Market Term Frequency
Counts stored text matches for foundational terms like slicer and procedural THREE.Group in analysed public discussions. These counts do not measure adoption.
Stored text matches, not adoption or market-share measurements.
- slicer: 2 records
- procedural THREE.Group: 1 records
- printable 3D model: 1 records
- single merged, watertight BufferGeometry: 1 records
- STL / OBJ / glTF export: 1 records
- print-prep: 1 records
- manifold/normals check: 1 records
- wall-thickness warning: 1 records
- scale-to-mm: 1 records
- hidden faces mirrored/approximated: 1 records
- sliceable STL: 1 records
- non-watertight geometry: 1 records
- node/collider hierarchy: 1 records
SaaS Metrics