This STL model (Bas-Relief) can be used with CNC routers and 3d printers.
Software you may be need is: Cura, Artcam Pro, Vectric Aspire, Cut3d, etc.
Also you may need a Mach3, LinuxCNC (EMC2) or other software for your CNC (depends from your CNC machine).
Skull with a knife.
Special Forces Skull.
As the material can be used:
Wood (imitation carving reliefs, mural)
Plastic (manufacture of molds for gypsum, etc.)
Download format: .zip