JF-TECH
engineering
From your idea to its realization — from simple 3D modeling to a complete prototype.
Jean Forest, engineer specialized in mechanics and integration, combines his expertise in the automotive industry and electric vehicles to bring your most ambitious projects to life, with flexibility and cost optimization.
Jean Forest
Mechanical Engineer & Integrator
Development of Prosthetics & Orthotics
Custom prosthesis design for upper limbs and animals via 3D printing. I handle specific requests where standard solutions are inappropriate.
Upper-limb prosthetics
Integrated hand prosthesis
5-finger prosthetic hand with full articulation, designed to offer maximum mobility. Complex mechanical structure with integrated actuators.
Aesthetic hand prosthesis
Aesthetic prosthesis made from flexible filament for a natural look and optimal comfort. Lightweight and customizable solution.
Mechanical articulated finger
Design of an articulated prosthetic finger with functional inter-phalangeal joint. Prototype validated by 3D printing.
Animal prosthetics
Design of front leg prosthetics for dogs, developed on specific request. Each model is studied from the animal's anatomy and validated by 3D printing before final manufacturing.
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BionicoHand Project
Since 2022, Jean Forest has been volunteering with My Human Kit, an association dedicated to open-source assistive technologies.
In 2023, participation in the development of BionicoHand V3, a fully open-source myoelectric prosthesis. Version V3 achieved 2nd place at Cybathlon 2024, an international assistive technology competition.
BionicoHand en action — Cybathlon 2024
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CAD Animation — BionicoHand
Real kinematics — BionicoHand
Professional Background
From international automotive industry to independent engineering — a career focused on design, innovation and custom manufacturing.
Professional Experience
ICN — Ingénierie Câblage Normandie
SAE solutions integration and design
Engineering — Transport
2025 — Present
Normandy, France
In partnership with ICN, design and production of components enabling the integration and mounting of SAE systems on transport vehicles. Creation of custom parts via dimensional measurement, 3D and 2D scanning to functionally and aesthetically integrate the various components (SAE system, counting unit, validator, tablet, sensors, etc.). From measurement to production, complete management of the integration.
INRIA
Design and manufacturing of the Flexilock Twist orthosis mechanism
Research — Medical sector
June 2025
France
Contribution to the manufacturing and design of an articulation device for an orthosis (Flexilock Twist) allowing the wrist to be locked in position. Based on an existing version, it was redesigned to improve reliability and optimize the locking mechanism as well as the architecture enabling adjustment and the lock/unlock system. The prototype is used by patients with position-holding difficulties following traumas; the orthosis is intended to ensure wrist support for people who no longer have active mobility of it. The prototype is made entirely with PETG 3D printing and standard parts to allow reproducibility and adaptation to any morphology. Project carried out in support of INRIA's CAMIN team.
My Human Kit
Upper-limb myoelectric prosthesis designer
Medical sector — Volunteer
August 2023 — Present
Rennes, France
Volunteer participation in the creation of an open-source myoelectric hand prosthesis (movements actuated by EMG signal). Responsible for the aesthetic and functional 3D design of the hand, excluding the motor system. The BionicoHand V3 participated in Cybathlon 2024 and finished 2nd in the 'Arm prosthesis' category.
EXTREM' VISION
Mechanical design and complex system integration
Mechanical engineering
February 2022 — May 2022
Rivesaltes, France
3 projects conducted in parallel: rehabilitation of a complex CAD assembly in SolidWorks, complete design of an integration housing for a waterproof optical system, development of a liquid cooling system for power electronics.
TOYOTA MOTOR EUROPE
Engine R&D Engineer
Automotive
June 2018 — June 2020
Brussels, Belgium
Technical transfer of engine parts from Toyota Japan Design to suppliers. Project manager from quotation to production phase. Prototyping on engine propulsion based on Fuel Cell technology (3D printing, welding, assembly).
ELECTRIC MOTION
Design Engineer
Sport — Electric motorcycle
February 2016 — November 2017
Montpellier, France
Complete design of the E-TREK model (chassis, analytical and numerical deformation study, thermoformed plastics). Improvement of the propulsion system (battery pack, BMS, motor). Parts tracking from design to production, implementation of quality control, supplier cost optimization.
JF-Tech
Upper-limb myoelectric prosthesis development
Medical sector — Independent
January 2022 — Present
Audierne, France
Parallel development alongside freelance activity of an open-source upper-limb myoelectric prosthesis. Hand design with anthropomorphic kinematics and optimal mechanical performance. Based on the principle of simplicity and feasibility economy.
Education
Mechanical Engineer
INSA Toulouse
Engineering degree · 2016
TIG Welder 141
Pôle Formation UIMM
Professional certification · 2020
CAD Software
Areas of Expertise
3D Modeling
Design of parts and complex assemblies, from concept to technical drawing.
Calculation & Simulation
Static and dynamic deformation calculations, stress analysis.
3D Printing
FDM, resin, flexible filament. Rapid prototyping and small series.
Integration
Mechanical, electronic and software integration for automated systems.
Automotive Industry
Experience in conventional and electric vehicles.
Retrofit & Obsolescence
Reproduction of obsolete parts, maintenance cost reduction.
Skills
Custom Projects
Projects completed for private and professional clients — from simple printed parts to complete industrial machines.
Custom Projects
A few examples of projects completed for private and professional clients. Each part is modeled and optimized before printing.
Dual speaker stand
Custom stand for two computer speakers. Desk mount, two circular slots — modeled in 3 views.
DR350 chain guard
Chain protection guard for 1991 Suzuki DR350. Reproduced identically with honeycomb grille for weight reduction and ventilation.
E-bike chain guide
Chain guide and guard for electric-assist bicycle. Lightweight structure with optimized cutouts.
Knife-making striking machine
Complete design of a motorized striking machine for a knife-maker craftsman. Frame, striking mechanism and integrated control panel.
Motorcycle license plate holder
Articulated license plate holder for motorcycle. Lightweight design with structural cutouts and adjustable mounting.
Motorcycle handlebar GPS mount
GPS watch holder for motorcycle handlebar. Handlebar clamp with adjustable holding system, 3D printed.
3D Printing Service
Import your 3D file, choose your material and get an instant price estimate before submitting your quote request.
Contact me
A project, a question, an urgent need? I respond quickly to your messages.
Information
Service area
France and Europe
Privacy
Data protected
Urgent need?
For urgent requests (deadline < 48h), mention it in your message. I offer an express service based on availability.
