Empowering lives through accessible prosthetics

3D printable prosthetic hands designed for every amputation type and use case. Open-source technology making advanced prosthetics accessible to everyone, everywhere.

Fully open source

Print in 48 hours

About Open Source Hands

We are a community building high-quality prosthetic hands that are accessible, repairable, and affordable. Our designs are open, our process is transparent, and our goal is to empower people globally—regardless of income or geography.

Open Hardware

CAD, BOMs, and assembly guides are freely available and continuously improved.

Community Clinics

Partners help fit hands responsibly with clinician oversight and safety checks.

Right to Repair

Users can service, upgrade, and customize components with local materials.

Who we are

Jackson Arnold

Mechanical Engineer & Biomechanical Masters Student

Designs modular, repairable mechanisms and leads community manufacturing efforts.

Joe Cowles

website

Software Engineer & PhD Student

Develops firmware, control algorithms, and user interfaces.

Features

Adaptive Grip Profiles

Switch between precision pinch, power grasp, and lateral key grip for daily tasks.

Serviceable by Design

Modular parts, standard fasteners, and community repair guides.

Comfort & Fit

Lightweight frames, soft liners, and cable routing for all-day wear.

Open Control Stack

EMG, IMU, and myo-compatible inputs with transparent firmware.

Local Production

CNC/3D-print friendly designs and documented materials sourcing.

Clinician Toolkit

Calibration workflow, fitting notes, and safety checklists.

User Customization

Swap covers, colors, sockets, and tune actuation to preference.

Accessible Pricing

Cost-based, per-hand pricing to maximize reach and sustainability.

Models

Each model shares a common, serviceable core with different actuation and control options. Choose lighter weight for comfort, or advanced sensing for more control.

Model	Control	Notes
OSHands-Lite	Passive + assist	Ultra-lightweight; ideal for first fit and low-maintenance use.
OSHands-Active	EMG dual-site	Everyday reliability with configurable grip profiles.
OSHands-Pro	EMG + IMU	High responsiveness and gestures; best for advanced control needs.

Contribute

Open Source Hands is built in the open. Whether you are an engineer, clinician, designer, maker, or prosthetics user, your insights and code can help more people access capable, affordable hands.

Code & Hardware

Help improve firmware, control algorithms, CAD, and testing.

Docs & Translations

Expand guides and translate resources so anyone can build and use a hand.

Clinical Feedback

Share real-world needs, comfort considerations, and fitting workflows.

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