This project is about developing an open, interactively programmed 3D printing system for live computational making. It explores the role of improvisation and intuition in making new computational forms. This system extends digital printing and CNC machining into the realm of performance and also has potential in design and science pedagogy. For this talk I will discuss my initial work creating this open software and hardware system for livecoding 3D printers, along with some examples of how this could be used in art and design.