Parametric design and three-dimensional printing: enabling Occupational therapists to develop custom hand grips.

Purpose: This study evaluates a parametric design tool created to support occupational therapists (OTs) in designing personalized assistive technologies (ATs). The tool enables users to modify existing three-dimensional (3D) handgrip models by integrating individual hand measurements and anthropometric data.

Materials and methods: We utilized an iterative prototyping approach to develop a parametric interface for the customized design of ATs and conducted user studies involving 12 OTs to assess the practical application of the tool and gather feedback on 3D-printed ATs. We investigated the properties and parameters of 3D printing, including the temperature, layer height, infill percentage, and material selection, to enhance the safety, durability, and hygiene of 3D-printed assistive devices.

Results: The parametric design tool received positive feedback from OTs for its ease of use, customization options, and real-time design capabilities, which they found beneficial for their professional practice. The integration of this tool with 3D printing technology has also been praised for its cost-effectiveness and efficiency, offering a unique solution for customized assistive devices that address current market limitations.

Conclusion: This study introduces an innovative design tool that enhances adaptability and specialized design in AT development by integrating digital fabrication into OT practice to create personalized devices tailored to individual needs. Our study highlights the importance of precise 3D printing parameter optimization to ensure that assistive devices are both functional and reliable. Ultimately, this study aimed to enhance activity performance, such as eating, for individuals with hand impairments, thereby supporting their continued independence in daily activities.