Prosthetics are becoming de riguer in athletic performance circles, but they’re pricey and don’t provide easy access for amateur or recreational amputee athletes. Industrial designer Chan Lee wants to change that for cyclists with his ZENOS 3D printed arm that’s specifically made for both road and mountain bikers. It’s an open-sourced prosthesis that incorporates an easy-lock and quick-release system, as well as an adjustable shock-absorbing elbow that’s meant to take on less-than-perfect road and off-road surfaces. The lock mechanism has its own hook that can grab and release from the handlebar, and the elbow utilizes a small custom-tuned bike shock that minimizes stress to the shoulder, an ingenious feature. The most important aspect, however, is the fact that the ZENOS is free to download and easy to assemble. Hell, it’s enough of a challenge to live in the world without a limb, but Lee uses his talents to generously offer a way for amputees to elevate their cycling game affordably and brilliantly.