In a new study, which may not come as a surprise to veteran makers, the cubic-subdivision won out over the octet, gyroid, grid, and concentric, among five others, as the infill that had the highest energy absorption efficiency due to its desirable "progressive folding" failure mode. This ensures that parts, like helmets, can absorb a maximum amount of energy while transmitting the minimum amount of peak force. Researchers used glass-filled PLA.