Affordable 3D-printed bionic arm uses muscle signals to move

His simple goal was to give more people access to advanced prosthetics that actually fit their lives. Today, the company's flagship product, TrueLimb, is helping adults and children around the world regain mobility and confidence.

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TrueLimb is a full-arm prosthetic solution designed to feel more like an extension of the body than a mechanical device. Each arm is personalized to match the user's opposing limb, down to fingertip size and skin tone. A wide range of color options are available, including natural shades, jet black and metallic silver. 

TrueLimb features TrueSense technology, which includes over 30 topographical sensors embedded within the socket. These sensors detect subtle muscle movements on the residual limb, delivering accurate and responsive control, even when the limb is covered or sweating.

While often referred to as "mind-controlled," TrueLimb does not read brain signals directly. Instead, it uses advanced sensors to pick up electrical activity from muscles in the residual limb. These signals reflect the user's intended movements, allowing the prosthetic to respond in real time, creating a seamless, intuitive experience that feels like second nature.

The system adapts automatically by identifying the most active myo sites, deactivating less useful sensors and fine-tuning responsiveness based on the user's signal strength. This ensures consistent performance, even if muscle activity changes over time.

The prosthetic includes six intuitive grip patterns to support a wide range of daily activities. Independent finger joints allow the hand to wrap around objects naturally, offering both strength and flexibility. The device is precise enough to handle delicate tasks, such as lifting an egg without cracking it. 

Beyond movement, TrueLimb gives the user back a sense of touch. Gentle vibrations provide feedback when the prosthetic hand makes contact with objects. This helps users operate the device without always needing to look down, making actions more fluid and natural. The thumb is manually opposable, giving the user better control over grip force and object handling. Whether opening a bottle or holding a pen, the motion feels smooth and confident.

TrueLimb is made with PA12 nylon, a highly durable material used in industrial-grade applications. The entire arm is built to withstand daily life. It's splash-resistant, heat-resistant, stain-resistant and tough enough to handle impact or abrasion. Thanks to its rubberized palm and coated fingertips, the hand maintains a firm grip on smooth or slippery surfaces. And with bionic strength, it can lift objects up to 15 pounds with ease.

One of the most innovative parts of the TrueLimb process is how it reaches users. Everything happens remotely. Users receive a 3D scanner in the mail to capture the shape of their limb. The data goes directly to the Unlimited Tomorrow team, which builds the prosthetic in-house. This approach eliminates middlemen and dramatically speeds up delivery. Users typically receive their completed prosthetic within weeks. 

Unlimited Tomorrow is revolutionizing prosthetics with TrueLimb. This device combines 3D printing, smart sensors and remote support to deliver a user-friendly solution. It's lightweight, strong, affordable and customizable. Most importantly, it brings freedom and functionality back to people who need it. TrueLimb proves that cutting-edge technology can be both personal and practical.

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