Investigating the Implications of 3D Printing in Special Education
Erin Buehler, Niara Comrie, Megan Hofmann, Samantha McDonald, Amy Hurst · 2016 · ACM Transactions on Accessible Computing (TACCESS) · doi:10.1145/2870640
Summary
This paper investigates the use of 3D printing in special education settings through case studies at three sites serving students with cognitive, motor, and visual impairments, and presents GripFab, a simplified 3D modeling tool designed for occupational therapists (OTs) to create custom assistive hand grips. The research identified three primary functions of 3D printing in special education: STEM engagement (giving students with disabilities hands-on making experiences), creation of educational aids for accessible curriculum content (tactile models, manipulatives), and fabrication of custom adaptive devices (grips, holders, mounts). The three investigation sites included a school for students with multiple disabilities where OTs used 3D printers to create custom grips for art supplies, a school for the blind where 3D printed tactile models supported geography and science education, and a technology lab serving adults with developmental disabilities where 3D printing provided vocational training. A detailed co-design case study at Site A followed the creation of a custom stylus grip for a student with cerebral palsy, involving iterative prototyping between researchers and OTs over several months. This experience revealed that OTs wanted the ability to create custom devices themselves but found existing CAD software intimidating, time-consuming, and inaccessible. GripFab was developed in response, abstracting 3D modeling into a step-by-step wizard with parametric fields — users select a base grip shape, adjust hole dimensions, and optionally add a barrel extension, all without mouse-driven 3D manipulation or CAD expertise.
Key findings
Through pilot testing and focus groups with OTs, the research revealed several key insights. OTs preferred generalized grip designs over user-specific ones, reasoning that grips usable by multiple students were more practical given their caseloads. The five most useful grip types identified were rocker, refined pinch, built-up, articulated container, and bottle grips — each addressing different grasping abilities and object types. OTs estimated that 3D-printed grips could be produced faster and more cheaply than ordering from commercial AT catalogs, which typically involved two-week wait times. However, significant barriers to adoption remained: 3D modeling software was universally found inaccessible (no open-source 3D modeler supported screen readers), printer reliability was a persistent problem requiring technical support that schools lacked, and training time was a concern for therapists already stretched thin. The school for the blind demonstrated that 3D-printed tactile models could transform geography and science education, but educators noted the need for accessible feedback from the printer itself — they could not visually determine if a print was progressing correctly. At the developmental disabilities site, existing mainstream 3D printing curricula were inaccessible, requiring substantial adaptation for students with cognitive impairments. GripFab feedback showed OTs wanted domain-specific language rather than CAD terminology, hot-swappable barrel attachments for different activities throughout the school day, and a profile system to store individual student measurements.
Relevance
This research provides a comprehensive roadmap for integrating 3D printing into accessibility practice, with actionable recommendations for four stakeholder groups: technology manufacturers (make printers and software accessible), 3D software developers (support parametric design, screen readers, and progressive complexity), therapists (budget time for iteration and consider in-house fabrication to overcome AT availability and cost barriers), and school administrators (plan for resource sharing, maintenance, and training). The concept of empowering therapists and end-users as designers of their own assistive technology — rather than passive consumers of commercial products — represents a potentially disruptive shift in AT service delivery. The finding that 3D modeling software is universally inaccessible to screen reader users is a significant gap that persists in the field. For the maker and fabrication communities, this work demonstrates that 3D printing in accessibility contexts requires fundamentally different tools and support structures than in mainstream education, with simplified interfaces, domain-specific vocabulary, and reliability being more critical than feature richness.
Tags: 3D printing · digital fabrication · special education · assistive technology · DIY assistive technology · occupational therapy · STEM accessibility · co-design