The file 'Egg Cup Osaka 3D Printer Model' is (STL) file type, size is 1.3MB.
How to construct an egg cup and design it in a CAD you can see on
https://nerd-corner.com/solidworks-tutorial-egg-cup-with-solidworks-revolved-boss-base-and-fillet-feature/
https://youtu.be/xwUzMaGpPVg