– Site for downloading industrial 3D files.STLFinder – STL file search engine for searching other sites.Cults – Many free STL files as well as premium 3D printer models.
Part 2: Sites hosting both free and paid-for 3D printer files The NIH 3D Print Exchange – Free Medical 3D Printer Models.NASA – Free space-related 3D printer models.Instructables – Free 3D Printer files with great guides.Thingiverse – Largest selection of free STL files.Part 1: Sites hosting only free STL files Top Picks Best XYZ Reviews – Full Round-Up