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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.
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.
Format comparison
| Feature | 3MF | BREP |
|---|---|---|
| File type | Cad | Cad |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | precise | precise |
| File size characteristics | depends | depends |
| Compatibility | limited | limited |
| Editability | high | high |
| Created year | 2015 | 1996 |
| Inventor | 3MF Consortium | Open CASCADE Technology |
| 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 | Supported | Not supported |
When to use each format
When to use 3MF
- design authoring
- review handoff
- manufacturing exchange
- Designed for additive-manufacturing workflows rather than generic mesh exchange alone.
When to use BREP
- design authoring
- review handoff
- manufacturing exchange
- Preserves exact geometry and topology for solids, shells, faces, edges, and vertices.
FAQs
Why convert 3MF to BREP?
Choose BREP as target when solid model exchange between OpenCASCADE-based CAD applications, engineering analysis preparation, and BREP-to-mesh conversion pipelines.
What changes when converting 3MF to BREP?
Solid model exchange between OpenCASCADE-based CAD applications, engineering analysis preparation, and BREP-to-mesh conversion pipelines.
What should I review after converting 3MF to BREP?
After conversion, review these destination checks: Open converted output in Open CASCADE and verify behavior on real samples; Compare output against the expected precise quality profile; Much less universal than exchange standards such as STEP or mesh formats such as STL and OBJ.
How can I keep quality stable in 3MF to BREP conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Strongly coupled to CAD-kernel concepts that many lightweight viewers do not implement; Much less universal than exchange standards such as STEP or mesh formats such as STL and OBJ; Validate destination compatibility before large-batch conversion.