  Tomographic volumetric additive manufacturing (VAM) is an optical 3D printing
technique where an object is formed by photopolymerizing resin via tomographic
projections. Currently, these projections are calculated using the Radon
transform from computed tomography but it ignores two fundamental properties of
real optical projection systems: finite etendue and non-telecentricity. In this
work, we introduce 3D ray tracing as a new method of computing projections in
tomographic VAM and demonstrate high fidelity printing in non-telecentric and
higher etendue systems, leading to a 3X increase in vertical build volume than
the standard Radon method. The method introduced here expands the possible
tomographic VAM printing configurations, enabling faster, cheaper, and higher
fidelity printing.

Optics