We report one of the first studies on direct 3-D printing of heterogeneous optical phantoms with programmable absorption and scattering properties using a multi-color mixing extruder. This method dynamically mixes off-the-shelf gray, white, and translucent filaments to achieve arbitrary target absorption and scattering coefficients. We use a spatial frequency domain imaging system to characterize and validate the printed properties and verify that they follow our hypothesized linear-mixing models. A complex phantom with five inclusions with distinct optical properties was produced and the measured properties compared to their predicted values showed an error between 12%-15%.
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