The file 'Egg Cup Osnabrück 3D Printer Model' is (STL) file type, size is 1.7MB.
https://www.youtube.com/watch?v=b3Q4FIFrxuc
How to construct an egg cup and design it in a CAD you can see on
https://www.nerd-corner.com/solidworks-tutorial-egg-cup-with-solidworks-revolved-boss-base-and-fillet-feature/