4-Bar Linkage BB Launcher

This is a spring-powered BB launcher featuring a unique 4-bar linkage mechanism with a single compliant spring for reset. It’s fully 3D printed in one piece—no assembly required. The integrated high-capacity magazine includes a slotted grid that shows how many BBs are loaded while securely holding them in place. Despite the complex geometry, everything prints cleanly without supports on a well-tuned printer like the Bambu X1.