Detection and correction of misalignment for high fidelity volumetric additive manufacturing.

Volumetric additive manufacturing (VAM) rapidly fabricates three-dimensional polymer structures by projecting images into a rotating vial of photosensitive resin. However, inevitable misalignment of this vial, the rotation system, and the projector limit the achievable resolution, fidelity and repeatability of VAM systems. In this work, we characterize the distinct impact of common misalignments through their distortion of a spherical test object. We then show that the ensemble of misalignments can be quantified with the addition of an imaging system. This information is then used to correct for the measured misalignment by modification of the projected images to enable reliable, high-resolution VAM dose delivery.