From Self‑Balancing Electric Bike to DIY Prosthetic Leg: A Maker’s Journey

The story begins with a striking self‑balancing electric bike that can move forward and backward on just two wheels, demonstrating impressive stability and speed, which the creator, known as bili_小宇吖, built as a personal project.

During testing, he set the gyroscope speed too high, causing the device to explode and injuring his left leg, leading to an amputation above the knee; the accident also damaged his workshop and left him with severe trauma.

After a successful surgery and rehabilitation, he recovered enough to walk with a cane, then a prosthetic, and within months could walk unaided, eventually returning to his work in non‑standard automation equipment.

Drawing on his background in 3D modeling, structural mechanics, mechanical engineering, CNC machining and software programming, he began modifying commercial prostheses, adding features such as a quick‑release joint between leg and foot, magnetic USB‑C charging, and smart knee actuation for smoother walking and stair climbing.

He also experimented with upgrades like hydraulic damping, LED lighting, and custom‑made limbs, documenting his process in concise technical videos that blend engineering detail with a light‑hearted style.

Beyond personal use, he aims to improve prosthetic accessibility, noting the high cost of imported devices and advocating for domestic production to lower prices.

The maker’s optimistic attitude and willingness to share his failures and successes have resonated with a large online audience, encouraging other amputees and showcasing how engineering can transform personal adversity into innovative solutions.