Designing a Wrist-Powered Hand Assist Device for Gary

This project was inspired by Gary, who experiences limited hand function. I wanted to explore whether a simple, affordable mechanical device could help improve hand movement without motors, batteries, or complex electronics. The goal was to create a practical assistive technology that could make daily activities easier while remaining accessible to more people.

Software

1. Fusion 360
2. A computer capable of running Fusion 360

Manufacturing

1. 3D Printer
2. PLA, PETG, or your preferred filament

Assembly Materials

1. Sewing thread
2. Sewing needle
3. Super glue

Optional

1. Sandpaper for finishing
2. Small pliers
3. Measuring caliper

To better understand the movement restriction, I temporarily limited my own hand movement during testing. This helped me evaluate the design more realistically and avoid making assumptions about how the device would perform.

My first prototype looked promising, but the geometry did not transfer enough force to the fingers. After testing, I redesigned the linkage system and adjusted several dimensions.

Fusion 360 allowed me to rapidly test different mechanical configurations before manufacturing the final version.

To evaluate the design under conditions closer to Gary’s situation, I temporarily restricted my own hand movement. This allowed me to test whether the mechanism could genuinely assist finger extension rather than relying on normal hand strength.

This is the section that directly addresses the competition theme.

Possible ideas:

1. Adjustable sizing.
2. Lighter materials.
3. Better comfort.
4. Custom-fit versions using 3D scanning.
5. Open-source designs for hospitals and rehabilitation centers.
6. Low-cost manufacturing for underserved communities.

In the future, devices like this could be customized and printed locally for individual patients. By combining digital design, 3D printing, and personalized rehabilitation tools, assistive technologies may become more affordable and accessible to people who need them most.

This project began as an attempt to help one person, Gary. However, it also demonstrates how accessible design tools and 3D printing can create personalized solutions for people with physical challenges. Small innovations developed for one individual today may inspire more accessible assistive technologies for the future.