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BREP at a glance
BREP
Boundary representation became a core idea in 1970s and 1980s solid modeling, and Open CASCADE's .brep files reflect that tradition by serializing exact topological and geometric entities for native CAD workflows.
3MF at a glance
3MF
The 3MF Consortium formed in the mid-2010s around a new additive-manufacturing exchange format, and the specification has since been recognized as ISO/IEC 25422.
Format comparison
| Feature | BREP | 3MF |
|---|---|---|
| File type | Cad | Cad |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | precise | precise |
| File size characteristics | depends | depends |
| Compatibility | limited | limited |
| Editability | high | high |
| Created year | 1996 | 2015 |
| Inventor | Open CASCADE Technology | 3MF Consortium |
| Status | active | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Common software |
|
|
| Archival suitability | moderate | moderate |
| Metadata handling | rich | rich |
| Delivery profile | limited | limited |
| Workflow fit | design | design |
| Layer support | Not supported | Not supported |
| Vector scaling | Supported | Supported |
| Structured data | Not supported | Supported |
When to use each format
When to use BREP
- design authoring
- review handoff
- manufacturing exchange
- Preserves exact geometry and topology for solids, shells, faces, edges, and vertices.
When to use 3MF
- design authoring
- review handoff
- manufacturing exchange
- Designed for additive-manufacturing workflows rather than generic mesh exchange alone.
FAQs
Why convert BREP to 3MF?
Choose 3MF as target when preparing models for 3D printing, especially when color, materials, units, multiple parts, or print-specific metadata should survive.
What changes when converting BREP to 3MF?
Convert to 3MF when preparing models for 3D printing, especially when color, materials, units, multiple parts, or print-specific metadata should survive. It is a strong target for additive-manufacturing workflows, maker pipelines, and print-ready model exchange. Choose it over STL when richer manufacturing semantics are needed.
What should I review after converting BREP to 3MF?
After conversion, review these destination checks: Open converted output in 3D printing slicers and verify behavior on real samples; Compare output against the expected precise quality profile; It is not as universally supported as the oldest legacy mesh formats.
How can I keep quality stable in BREP to 3MF conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Some downstream tools still flatten workflows back to simpler mesh-centric assumptions; It is not as universally supported as the oldest legacy mesh formats; Validate destination compatibility before large-batch conversion.