The file 'Skyscraper Footing 3D Printer Model' is (stl) file type, size is 38.6KB.
This is an example of the footing (grillage) of a skyscraper.
https://www.metabunk.org/data/MetaMirrorCache/contrailscience.com_skitch_3819594000_cc2e293f0a_o.jpg_20130214_091226.jpg