These slabs are constructed from two varieties of triply periodic minimal surfaces, the “Fischer-Koch S” and the “SplitP”.

See here for video: https://youtu.be/vKTHPB9hKvQ

See here for stable downloads:
Fischer-Koch S: https://than.gs/m/868235
SplitP: https://than.gs/m/868254

The slabs are 3 x 3 x 2 cubes of unit cells, with the central top cell removed to allow placement of a square vase or other similar type of container. Three different heights of square containers are included.

The footprint of each is approximately 100mm x 100mm.