Reverse engineering: reproducing a part in 3D

What is reverse engineering?

Reverse engineering (rétroconception or rétro-ingénierie in French) starts from a physical object to rebuild its digital definition. It is the solution when a part has no drawings, or when you want to copy it, modify it or remake several copies.

Scanning a part isn't enough

A 3D scan is an imprint: it also reproduces wear, distortion and measurement noise. Printing a scan directly rarely gives a part that fits well. The scan serves as a reference to rebuild a true CAD model with the right dimensions.

A clean model, not a copy of the scan

The part is remodelled with controlled solids: fitting dimensions recovered, bores and fits restored to the right values, wear compensated. The model is editable: you can reinforce an area, change a fixing or adapt the part to another use.

Reproducing a part in 3D, step by step

1. Survey — measurements, dimensioned photos or 3D scan.
2. Reconstruction — parametric CAD model, design intent recovered.
3. Verification — comparison with the scan or the part, check of fitting dimensions.
4. Files — STEP for machining, STL for 3D printing, dimensioned drawings.

If the goal is to get the finished part back, see unavailable spare part. For a company that needs parts surveyed on its premises, see on-site industrial reverse engineering.

Frequently asked questions

Is a 3D scanner always needed?

No. Many parts can be measured perfectly well with conventional instruments. 3D scanning is used when the shape calls for it.

What's the difference between rétroconception and rétro-ingénierie?

None in practice: both French terms, like reverse engineering, mean rebuilding a model from an existing part.

Can I 3D-print the part myself?

Yes: you receive the STL file, with advice on material and orientation if the part carries loads.

Which file formats do you provide?

STEP and IGES for 3D models, STL for 3D printing, PDF and DXF for drawings.