Convert STEP geometry to a triangle mesh
A STEP-to-STL workflow prepares CAD data for slicers, mesh processing and geometry-only delivery. STEP and STP are two extensions used for native STEP files. The input may contain BRep geometry, mesh data, or a combination; the conversion must inspect the representation before deciding whether tessellation is needed.
For BRep faces, generate a surface mesh with the required chordal and angular deflection. For mesh input, use the existing tessellation and perform any preparation required by the destination. Export the resulting triangles with the OCCT STL writer.
Prepare the model for its destination
- Read the STEP file and identify the parts to export.
- Apply the required assembly placements and agree on the output coordinate scale.
- Tessellate BRep surfaces, or prepare the source mesh.
- Write STL and reopen it in the intended receiving application.
Express Mesh provides element-size and deflection controls. BRepGraph Advance offers another meshing workflow with configurations for visualization and material removal.
What changes in STL output?
STL carries triangle geometry. Product names, assembly hierarchy, PMI and materials need another delivery format or an accompanying application record. Units must be agreed with the receiver rather than inferred from the STL filename.
For printing, check open boundaries, orientation, scale and the selected parts. Tessellation alone does not repair all invalid geometry or make an assembly suitable for printing. Retain the original STEP model when later CAD editing or a different tessellation may be required.