Thingiverse

Thingiverse is a website dedicated to the sharing of user-created digital design files. Download files and build them with your 3D printer, laser cutter, or CNC. Thingiverse is a universe of things. Providing primarily free, open-source hardware designs licensed under the GNU General Public License or Creative Commons licenses, the site allows contributors to select a user license type for the designs that they share.

https://www.thingiverse.com/