Yobi3D is a bleeding edge search engine that helps you find free STL files, and then offers comprehensive features like 3D visualization, sharing, and even one-click 3D printing. With this workflow, you can select any number of 3D printer models and have them fabricated without even touching a 3D printer. The numbers of free STL files may not be as big as with its competitors, still, this 3D model search engine is worth a try.
(Yobi3D)
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