Dassault Systèmes: 3D Content Central 2016. 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 1,781,868 CAD users who share and download user contributed and supplier-certified 2D and 3D parts & assemblies, 2D …