From design to print

2. Finding open designs online

If you just want to try 3D printing without having to design something, you can also find free, open designs online in one of the many repositories that exist.

Thingiverse - https://www.thingiverse.com/

One of the most popular free repositories, Thingiverse is an online platform for discovering, making, and sharing 3D printable things, operated by MakerBot.

YouMagine - https://www.youmagine.com/

YouMagine is a community website operated by Ultimaker.

Libre3D - http://libre3d.com/            

This site is dedicated to being a source for 3d printer help, printable 3d object files, and much more, with a focus on the open source 3d community.    

NASA 3D Resources - https://nasa3d.arc.nasa.gov/models/printable

3D printable models created by NASA.   

Cults 3D - https://cults3d.com/en

Digital marketplace for 3D printing and design.

Pinshape - https://pinshape.com

Selection of premium and free STL files for download and print.

NIH 3D Print Exchange - https://3dprint.nih.gov/

3D printable models related to biomedical science.

Embodi3D - https://www.embodi3d.com/files/

Biomedical 3D printing community.

GrabCAD - https://grabcad.com/library

Online library with free engineering CAD files.