Know a thing or two about 3DP, but haven't had anything to contribute. With vqc back, will flag this thread in the rsa10 and ask him to pop in. My guess is specific material structures are what he had in mind, printed into appropriate shapes. Think along the lines of the specialized properties of materials in pyramids - granites selected and brought in, also some of the composite cast materials having various quartz and other crystalline materials mixed and set. Micro/Macro geometries working together.