Interestingly, other modifications to the conventional LSC design show limited improvement to performance. For 3D printed LSC, we observed greater similarity between the surface normal and enclosing box methods, and interestingly a higher efficiency than analogous bulk parts is predicted. In practice, however, this improvement has not yet been demonstrated experimentally for our 3D printed LSCs, which we attribute to the low quality of our in-house extruded LR305-PMMA filament. Using pvTrace to extrapolate the potential efficiency based on a higher quality filament with reduced waveguide absorption (0.2 cm -1 as obtained for commercial PMMA filament, vs the 5 cm -1 measured for our filament), a threefold increase in the efficiency of a square LSC is predicted, from 4.88% to 15.97%. For comparison, the corresponding bulk part has an efficiency of 11.28%. If this efficiency improvement can be validated experimentally, this may have important ramifications for future LSC designs.