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Bob Jones Student Builds Modular Prosthetic Arm for Sister After 100 Hours of 3D Printing

Vitaliy Bondarchuk didn’t go to a lab. He went to his dorm room. The Bob Jones University engineering student built a modular prosthetic arm for his 7-year-old sister Bella — from scratch, over roughly four months, with more than 100 hours of 3D printing behind it.

The arm isn’t a single rigid device. It’s built around interchangeable attachments, each one tailored for a specific daily task. Painting. Playing games. Basic everyday stuff that a standard pediatric prosthetic often can’t handle well. Bondarchuk’s core frustration with existing options was pretty clear: most commercial prosthetics for kids focus on clinical specs, not on what a child actually does all day. They tend to force families into a trade-off — either versatility or comfort, rarely both — and the price tags make customization basically out of reach for many. His design tried to cut through all of that.

100 Hours, Four Months, Countless Iterations

Getting the fit right turned out to be harder than building the modular system itself.

Bondarchuk went through iteration after iteration, refining comfort and usability at each step. One specific problem he had to solve: the rigid 3D-printed materials irritated Bella’s skin during wear. His fix was an anti-friction lining built into the socket, reducing that friction without sacrificing the structural integrity of the arm. Small detail, but it matters a lot when a 7-year-old is supposed to wear something for hours.

The full timeline ran about four months — from early concept work to final presentation. And the final deliverable wasn’t just the arm itself. Bondarchuk also produced technical manuals as part of the project package. So not just a working device. A documented one.

3D printing made the fast iteration possible in a way traditional manufacturing probably couldn’t. When a fit was off or an attachment wasn’t working, he could adjust the design file and reprint. No waiting weeks for a machined part. No expensive tooling. Just another print run and another test. That speed of iteration is one of the bigger arguments for additive manufacturing in custom medical devices, and Bondarchuk’s project is a decent real-world example of why.

Top Marks and a GE Vernova Offer

The project earned him an A at Bob Jones University. Top academic honors. But the professional payoff went further than a grade.

Bondarchuk got accepted into GE Vernova’s Operations Management Leadership Program. It’s a competitive track — the kind that puts engineers in front of significant industrial assignments early in their careers. Hard to say exactly how much the prosthetic project drove that outcome, but it’s not a stretch to think a working, documented, real-world engineering solution made an impression.

He’s still working on new attachments. His older brother is involved in that ongoing development. The goal seems to be expanding what the arm can do — not just for Bella, but potentially for other kids who are similarly underserved by what’s currently on the market.

A Bigger Problem Behind One Family’s Solution

Bella actively uses the arm now. It’s part of her daily routine. That real-world use matters — a lot of prototype assistive devices never make it past the lab or the demo stage. This one did.

But Bondarchuk’s project also points at something bigger. Pediatric prosthetics are a genuinely difficult market. Kids grow fast. Their needs change. A device that fits well at age 7 won’t fit at age 9. Commercial manufacturers have a hard time making that economics work, which is part of why families often end up with devices that are either too expensive to replace frequently or too rigid to adapt. Modularity — the idea that you swap out attachments rather than replace the whole device — is one way to address that. It’s not a new concept in prosthetics broadly, but it’s rarely applied well at the pediatric level, probably because the market is smaller and the engineering challenges are tougher.

Bondarchuk’s version is specific to Bella. It’s sized for her, designed around her activities, and refined based on her feedback over months of iteration. That kind of personalization is hard to replicate at commercial scale, but it’s exactly what a lot of families say they need and can’t find.

And the family angle matters here too. The project started because Bondarchuk looked at his sister’s situation and didn’t see a good option on the market. That’s a pretty direct motivation. No grant funding mentioned, no research lab, no corporate sponsor. Just a student, a dorm room, a 3D printer, and about four months of work.

His older brother is still in the mix as new attachments get developed. No timeline on that. No details yet on whether the design could be shared more broadly or adapted for other children. Unclear if there’s a path to any kind of production beyond the current one-off. But the arm works, Bella uses it, and Bondarchuk is now inside GE Vernova’s engineering pipeline.