Accessibility Projects: 3D-Printed Assistive Tools Students Can Design and Build

Some of the most meaningful engineering a student will ever do is designing a slightly wider grip for someone whose hands don't close as easily as their own. It's a real constraint, a real user, and a real chance to see whether their design actually helps — which is more than most classroom engineering projects can offer.

Before anything else, here's the framing that needs to be clear from the start of this unit, both to you and to your students.

What This Unit Is — and Isn't

These are design-thinking and empathy exercises, not medical-device engineering. Students in a classroom setting do not have the training, testing resources, or regulatory oversight required to design assistive equipment that someone should depend on for their health, safety, or daily independent function. What they're building are learning projects — and, when a willing participant is involved, thoughtful gifts made with good intentions — not a substitute for a professionally fitted, clinically evaluated assistive device.

This distinction isn't a legal formality to skip past. It's the actual ethical foundation the unit rests on. A student-designed jar opener that a family member enjoys using because a kid made it for them, with full understanding that it's a fun personal project, is a wonderful outcome. A student-designed grip aid presented as something someone should rely on for daily function, without that context, is a different and more concerning thing entirely. Set this expectation clearly with students before they start designing, and mention it again when any project is shared with someone outside the classroom.

Example Projects

Adapted Utensil Grips

A larger, more textured handle that slides over or replaces a standard utensil handle, designed for someone who has difficulty with a thin, hard grip. This is a great entry point project because the design problem is easy to understand and the printed result is immediately testable — does it feel more comfortable and secure to hold than the original?

Jar and Bottle Opener Aids

A textured, extended-leverage grip that makes twisting a stubborn lid easier. This project naturally teaches the mechanical concept of leverage alongside the accessibility angle — more torque with less hand-closing force required.

Page-Turning Aids

A small finger-mounted or handheld tool with a slightly tacky or textured tip that makes it easier to separate and turn a single page without needing a precise pinching grip. A genuinely useful, low-complexity design challenge.

Zipper Pulls

A larger, easier-to-grasp loop or tab that attaches to an existing zipper pull, making it easier to grip and pull for someone with limited fine-motor dexterity. One of the simplest projects in this set and a good option for younger students or a first attempt at the unit.

One-Handed Device Stands

A stand that holds a phone, tablet, or book at a stable angle, designed for someone who needs both hands free or can only reliably use one hand. This project introduces a slightly more complex design challenge — the stand needs to actually balance the device's weight reliably, which is a good stability and center-of-gravity lesson.

Running the Design Process

Treat this unit as a structured design-thinking exercise rather than an open-ended craft project — the structure is part of what makes it a genuine engineering lesson rather than just a nice gesture. A simple four-step process works well:

1. Interview, don't assume. If a student has a willing participant in mind — a family member, a friend, even a hypothetical scenario the class discusses together — start by identifying the actual specific difficulty, not a general assumption about what "someone with limited grip strength" needs. A real, specific problem ("this particular jar is hard to open because the lid is smooth and small") produces a better design than a generic one.
2. Sketch before printing. Have students draw two or three different approaches to the same problem before committing to a Tinkercad design. This slows down the instinct to print the first idea that comes to mind and often produces a better second or third concept.
3. Print a rough first version. Just like any first print, expect the first attempt to reveal problems the sketch didn't show — a grip that's too large to hold comfortably, a stand that doesn't balance correctly. This is expected and useful, not a failure.
4. Test with feedback, then revise. If a willing participant is testing the design, have students ask specific questions about what worked and what didn't, rather than just asking "do you like it?" Specific feedback produces a better second version.

Material Notes

Grip surfaces are where filament choice does real, functional work in this unit. TPU is a flexible filament that can be printed at different hardness levels depending on the Shore hardness rating, and picking the right hardness for a grip surface — comfortable and slightly compressible versus firm and supportive — genuinely changes how a project functions, not just how it feels.

For a comfort-focused grip, like the utensil handle or the page-turning aid tip, a softer TPU in the 85A range gives a cushioned, slightly compressible surface that's comfortable against skin for extended handling. For a grip that needs to hold its shape under more twisting or pulling force, like the jar opener or zipper pull, a firmer TPU around 90A provides more structural support while still offering better grip and shock absorption than a rigid material like PLA would. Rigid structural components — the base of a device stand, the shaft of a utensil grip before the soft outer layer — print well in PLA+, which gives the added durability these hands-on, frequently-tested projects need over standard PLA Basic.

Choosing the right TPU hardness isn't guesswork — it follows directly from what the part needs to do. Our TPU Shore hardness guide walks through the full range from 70A through 95A and what each is actually suited for, which is worth reading with students as part of the material-selection step of this project — deciding on hardness is itself a real engineering decision, not just a color-and-size choice.

Why This Unit Is Worth the Extra Care

It would be simpler to skip the framing conversation and just let students design "cool gadgets." We don't think that's the better version of this unit. When students understand clearly that they're solving a real, specific problem for a real person — with appropriate humility about the limits of what a classroom project can responsibly claim to do — the engineering decisions start to matter in a different way. Grip diameter isn't an arbitrary design choice anymore; it's a response to a stated need. That shift, from designing for an abstract spec to designing for a specific person's stated difficulty, is a genuinely valuable engineering habit, and it's the reason this unit is worth the extra care in how you introduce it.

A Responsible-Use Note, Restated

Before any project leaves the classroom — handed to a family member, brought home, given as a gift — repeat the framing from the start of this unit clearly with students: this is a design-thinking project made with care, not a medical or clinically evaluated assistive device, and it isn't a replacement for a professionally fitted tool if someone has an ongoing medical need. If a student's family member has a genuine, ongoing need for assistive equipment, the right next step is a conversation with an occupational therapist or appropriate medical professional — not reliance on a classroom project, however well made. Framing the unit this way from day one, and again at the end, keeps the empathy and design lesson intact without students or families walking away with the wrong impression of what was built.

If a Student Wants to Go Further

Occasionally a student gets genuinely invested in this unit and asks whether they could pursue assistive design more seriously — as a longer project, a science fair entry, or even a future career direction. That's a great sign, and worth encouraging with the same honest framing as the rest of the unit: real assistive-device design is a specialized field that involves occupational therapists, biomedical engineers, and often regulatory review, depending on the device. A classroom project is a legitimate and valuable first exposure to that field, but the path from here to designing something someone can safely depend on daily involves training and oversight well beyond what a school project provides. Pointing an interested student toward occupational therapy or biomedical engineering as a field of study is a more honest and more useful next step than suggesting their classroom prototype is close to ready for real-world reliance.

Getting Started

Stock TPU-85A Matte for comfort-focused grip surfaces and TPU-90A Matte for firmer, more structural grip applications, alongside PLA+ for the rigid components of each design. All three are available at Filazoo's collection. Start with one simple project — the zipper pull or utensil grip are the most forgiving first attempts — before moving into the more mechanically involved device stand design.