In this paper, we propose a novel design for a three dimensional proximity sensor. The novel design takes advantage of rapid prototyping capabilities offered by 3D printing to produce mesa pyramids with a 55 ° base angle that comprise a two-pixel system. The two pixel system combines photoconductivity and plane wave propagation properties of a radiative source to approximate the source distance as well as direction with respect to the two-pixel system. We have used commercially available silicon photodiodes as active sensing material on the facets of the mesa pyramid bases, whereby each facet would measure the incoming radiation separately. The design offers a simple geometry suitable for integration with other electronic designs and allows for cost effective directional photoconductive sensors that can be implemented in high precision applications such as autonomous vehicles, robotics and industrial automation processes.