CAD Kernel in Rust faster than SMLib

next.BREP.io presents a Rust-built CAD platform that combines mechanical and electronics design in one application and document. Its mechanical tools include constrained sketches, parametric feature histories, sheet-metal design, assemblies, and solid repair. The kernel works with exact boundary-representation geometry, including analytic and NURBS surfaces, and supports STEP and IGES import and export. The application runs in a browser or as a native Windows or Linux program, using the same codebase; browser files remain in local storage rather than being uploaded. Despite the “faster than SMLib” framing, the supplied material gives no benchmark results or direct performance comparison with SMLib.

The distinctive proposition is that electronics and mechanical work stay connected: PCB footprint placement sets a part’s assembly pose, and schematic or wiring-diagram connections can produce modeled harnesses with cut lengths and bill-of-materials entries. The platform also offers board layout, autorouting, KiCad library import, manufacturing output, and shared undo across workbenches. Users can export bills of materials and fabrication files, while a native MCP server lets AI assistants create or edit features, inspect geometry, and run modeling tasks headlessly. A separate STL-to-STEP tool reconstructs recognized analytic surfaces from meshes. The project emphasizes local file control, public development, documentation, and community feedback, and invites sponsorship and investment.