Development of Computed Axial Lithography for engineering polymers: mechanical and optical properties, spatial resolution, and multi-material interfaces. The project demonstrates and optimizes a new approach to 3D printing—Computed Axial Lithography (CAL)—which challenges conventional wisdom in the field of additive manufacturing by showing that arbitrary 3D geometries can be produced without relying on slow, sequential patterning of many layers of material. Instead, CAL produces the entire 3D volume of a desired object at once, by rotating a container of photosensitive material relative to a temporally evolving projected light pattern. The light penetrates through the printing volume and as the container rotates, the projected pattern changes—thousands of times per revolution—so that the total illumination dose received at every location in the volume is controlled independently. Where the dose exceeds a threshold, a transformation of material occurs, forming the object.