Resources

3DContentCentral

Primarily targeted at solidworks users this website contains a large selection of CAD models and even common parts for mechanical engineering, PCB design and more.  We highly recommend this site for engineers who are assembling products that contain many purchase parts.

http://www.3dcontentcentral.com/
Free 2D and 3D CAD Models of User-Contributed and Supplier-Certified Parts & Assemblies, 2D Blocks, Library Features, Macros, and more
3D ContentCentral® is a free service for locating, configuring, downloading, and requesting 2D and 3D parts and assemblies, 2D blocks, library features, and macros. Join an active community of 1,231,455 CAD users who share and download user contributed and supplier-certified 2D and 3D parts & assemblies, 2D blocks, library features and macros.

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