These skulls demonstrate three of the architecting features in nTopology software.

See here for video: https://youtu.be/ZX4rk4VM46U

See here for stable downloads:
Gyroid: https://social.thangs.com/m/365047
FCC: https://social.thangs.com/m/365043
Hex Honeycomb: https://social.thangs.com/m/365051

The Gyroid Triply Periodic Minimal Surface, Face Centered Cubic Lattice and Hexagonal Honeycomb unit cells have been applied to a conformal cell map derived from the outer surface of the skull. Using this technique allows the structures to follow the contours and converge on the front and back of the skull.

The model pictured is printed with Eryone Matte Dew White PLA filament.