Convert CATPRODUCT to STL

3D printers, slicers, mesh viewers, and inspection tools generally do not open CATIA’s native assembly format, so a CATProduct assembly must be tessellated into STL for those workflows. The result is a printable triangle mesh, not an editable CAD assembly.

What the CATProduct format is

.CATProduct is CATIA V5’s assembly format. It stores the product hierarchy, component placements, constraints, and links to referenced .CATPart and subassembly files; the product file may not contain the component geometry itself. CATIA V5 users in mechanical design, aerospace, automotive, and manufacturing commonly exchange CATProduct assemblies with their referenced files.

Keep the complete reference structure available before conversion. A CATProduct copied without its linked CATParts can open with unresolved references or export an incomplete assembly.

What the STL format is

.STL represents the exterior surfaces of a model as connected triangles. Slicers, most 3D-printing software, mesh viewers, and many inspection applications support it.

STL does not retain CATIA features, sketches, constraints, assembly relationships, materials, colors, part names, tolerances, or parametric editability. It is appropriate when the receiving application needs a mesh rather than an exact CAD model.

How to convert a CATProduct assembly to STL

Using CATIA V5

1. Open the CATProduct in CATIA V5 with every referenced CATPart and subassembly available.
2. Hide or suppress components that should not be exported, such as fasteners, construction geometry, internal parts, or manufacturing aids.
3. Activate the licensed workbench that provides STL export, commonly Start → Infrastructure → STL Rapid Prototyping.
4. Run the STL export command, select the product or required components, and choose the output filename and folder.
5. Set the tessellation tolerance, sag, or angular deviation if available. Use a finer tolerance for curved or dimension-critical surfaces, while avoiding unnecessarily large meshes.
6. Open the STL in a mesh checker or slicer and confirm its scale, included components, surface closure, and orientation.

CATIA workbenches and licenses differ. If the installed configuration cannot export a product directly, use Tools → Generate CATPart from Product or the equivalent assembly-derived-CATPart command, then export the resulting CATPart as STL. This can combine the selected visible geometry into one part; export individual CATParts instead when separate print files are required.

Using CAD Exchanger Desktop

CAD Exchanger Desktop can import CATIA V5 assemblies and export selected geometry to STL. Install a current version, make the CATProduct and all referenced CATParts accessible, import the assembly, select the product or required components, choose Export → STL, and set mesh accuracy and units. Verify the vendor’s current CATIA support and licensing because supported CATIA releases and export options can change.

Using an online converter

An online CAD conversion service is suitable only for nonconfidential assemblies and only when it explicitly accepts CATProduct assemblies with linked CATParts. A service that accepts CATPart, STEP, or IGES does not necessarily support CATProduct. CAD Exchanger Cloud is an option to check, but upload limits, supported releases, processing behavior, and privacy terms vary; package all dependencies as required by the service.

Quality and compatibility checks

• References: include every dependent CATPart and subassembly. Missing references produce missing geometry in the STL.
• Output structure: exporters may create one combined mesh or separate STL files. Separate files allow independent print orientation, repair, and material assignment.
• Tessellation: coarse settings create visible facets and can alter curved dimensions; excessively fine settings create large files without useful accuracy beyond the printer or inspection device’s resolution.
• Units: STL has no dependable unit standard. Confirm the exporter’s units and measure a known feature in the slicer before printing.
• Mesh validity: check for open edges, inverted normals, self-intersections, duplicate faces, internal surfaces, and overlapping solids. Repair reported defects before slicing.
• CAD fidelity: use STEP or the native CATIA files instead of STL when downstream users need exact faces, tolerances, assembly constraints, or further parametric editing.