01 / 03
Design
3D modelling of parts, assemblies and structures. Technical drawings and selection of sections, materials and connections.
FreeCAD · 3D model · dimensioned drawings
Engineering and technical consulting Design, analyse, build.
LEFFIE is a mechanical and structural engineering consultancy. 3D design, finite element analysis and project management: from the first sketch to the finished part.
01 · Expertise
From sketch to finished part
An engineering study can cover one of these three stages or the full process. In every case, assumptions, calculations and conclusions are documented.
02 / 03
Analyse
Finite element analysis: stresses, deformations and safety factors. Each result is linked to its assumptions in a calculation report.
CalculiX · meshing · calculation report
03 / 03
Build
Project management through to the finished part: manufacturing documentation, sourcing subcontractors and overseeing the prototype.
Prototype · manufacturing · follow-up
02 · Current project
Protection against drones
LEFFIE develops protective structures against drones.
The project draws on the full engineering process: structural design, strength analysis and manufacturing preparation. It is under development and its details are not public.
03 · Deliverables
What you receive
Documents designed to be reviewed, shared with the workshop and kept for reference.
A
3D model
The part, assembly or structure modelled in FreeCAD.
B
Drawings
Dimensioned views with title blocks, ready for manufacturing.
C
Calculation report
Assumptions, mesh, boundary conditions, maximum stresses and safety factor.
D
Recommendations
What needs to change, and why: section, thickness, material or assembly.
Tools FreeCAD and CalculiX are open-source tools: your models are not locked into a proprietary format.
04 · About
One consultancy, one point of contact
Clément Lacoste President of LEFFIE Mechanical engineering student at ENSTA
LEFFIE is an engineering and technical consulting company founded in October 2026 in Casseuil, Gironde, France.
It was founded and is led by Clément Lacoste, a mechanical engineering student at ENSTA. The person who receives your enquiry is also the person who models, analyses and writes your report.
The logo reflects our work: a hexagon evokes load-bearing structures and analysis meshes, while an L shaped like folded sheet metal marks the point where a design becomes a part.
05 · Contact
A part to design, a structure to assess?
Describe it in a few lines. You will receive a detailed quotation valid for 30 days.
For an accurate quotation, include
- the scope of the study and intended use;
- materials and dimensions, even approximate ones;
- loads or requirements to be met;
- your preferred deadline.