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 ...

Cura is a free open-source 3D printer slicer for Windows ... Cura is compatible with various file types, such as STL, OBJ, 3MF, X3D, PNG, JPG, GIF, and BMP. You can extend Cura's functionality ...