Key Takeaways Bondarchuk spent 100+ hours 3D printing Bella’s modular prosthetic arm. Bella, 7, uses the device daily, highlighting cheaper pediatric options. GE Vernova hired Bondarchuk as he develops attachments for more kids. Vitaliy Bondarchuk’s dorm-room engineering project started with a family problem: his 7-year-old sister, Bella, needed a prosthetic that could keep up with childhood, not just fit a clinic checklist. He fed designs through a 3D printer for more than 100 hours, iterating toward a modular arm that can swap attachments for different daily tasks. The work highlights a stubborn gap in pediatric prosthetics, where affordable options often …