Yeggi is like the Google of 3D printing, it’s an index of ONLY 3D printable models. Still, Google is smarter than the search functions in most file repositories so this basic method might be all you need. Trying Googling Cardinal stl and you get anything BUT a 3d printable file.
Louis, so some searches might just give you things from around here. STL also happens to be the nickname/airport code for my hometown of St. I suggest doing an image search to save yourself a few clicks. Try searching for the thing you want AND include “stl” or better “stl file” and you’ll find lots of interesting things to print. The most obvious method - using a search engine - works fantastic for finding stl files. Some of my favorite 3D prints by Hex3d (Grogru), Iczfirz (Mando), Creative Tools (Benchy), Isaiah (Friendly Slug), Fotis Mint (Luke) and Wekster (Mini Joel).