We at Nanowerk do not endorse or encourage piracy at any level or in any form. While looking through 3D print websites for free 3D STL files, all the responsibility falls on you to check the copyright ...
It’s uncommon, but you should be worried if you cannot find your files and folders on your Windows 11/10 PC. Usually, it happens because you may have moved to another folder and deleted it.
As someone who's really into 3D printers, this opens up a whole new creative avenue for me to finally start creating my own models to print, instead of searching online for free STL files.