Mechanical Desktop is a 3D solid modeling program and Autocad is a 2D program. You can do 3D solid models with Autocad, but it is quirky and a waste of time.

RS Components (RS), the trading brand of Electrocomponents plc (LSE: ECM), a global multi-channel distributor, unveiled a new version of DesignSpark Mechanical, the leading free-for-download 3D ...