There are a few potential explanations for this phenomenon. Several previous experimental and simulation studies have reported differences in optical efficiency between flat and curved LSCs, due to differences in optical path lengths and escape cone losses. Since curved surfaces are created from the printed paths, this could explain the increased efficiency. Another potential explanation is the 3D printing paths function similarly to fiber optic cables and help guide light to the edges of the device. The result of these two effects would be increased efficiency due to improved directionality of light, as photons are guided more effectively towards the edges and are emitted more orthogonally than in bulk parts. While this is qualitatively seen in ray-tracing simulations, more rigorous experimental analysis would be needed to confirm this phenomenon.