Cadstar Board Modeler Lite 9.1 is a full 3D modeler for close collaboration with MCAD. Can import or export mechanical constraints like chassis and heatsinks through STEP, ACIS (SAT), STL or IDF. Can conduct 3D collision checks and measurements; can correct issues and back-annotate changes to MCAD and Cadstar. Reportedly has a 3D model wizard for creating almost any 3D part.
Zuken, http://www.zuken.com/en/products/pcb-design/cadstar/compare/pcb-layout/board-modeler-lite