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Tomographic vat photopolymerization offers high speed, auxiliary-free 3Dprinting. A fundamental limitation to this emerging technology is thenon-negativity constraint, i.e., light engines cannot deliver the informationcarried by the negative values in a tomogram. We introduce binaryphotoinhibition, which creates a stationary state with controllable stabilityfor every voxel individually. The information carried by negativities isdelivered by a second light engine as external stimuli. We employ theoxygen-lophyl radical pair in free radical polymerization to show that removingthe non-negativity constraint increases print accuracy, prolongs processwindow, accelerates printing and enhances property modulation. The resultcompletes the theoretical framework of reversing tomographic reconstruction forultrafast 3D printing and enables the direct transfer of knowledge associatedwith computed tomography to improve print accuracy.

Creating negative illumination for tomographic 3D printing via binary photoinhibition