Specialised engineering 2D/3D CAD and Parametric design for mechanical engineers. Create and unfold sheet metal duct, structural steel and fabrication designs for manufacture. It handles everything from simple cylinders, cones, rectangular ducts and ovals, to adapters, adapting any of these section types, interections and multi-intersections between of any of these types to any level of complexity. The software integrates to general CAD systems via DXF files, exporting both 2D patterns and 3D models.