Thingiverse.com A site for finding, creating, and sharing 3D printable things. All patterns are open source, available under a Creative Commons license.
MyMiniFactory.com A site that is a "curated social platform for 3D printable objects. It offers free downloads for all printable objects.
Pinshape.com A site that has both free and priced 3D printable objects.
For a list of sites offering free stl files, see https://all3dp.com/best-sites-free-stl-files-3d-printing/ .
Printing is a mediated service. To reserve a time to print your 3D item at Hatch Science Library, please contact
Sue O'Dell (207-725-3265, sodell@bowdoin.edu)