TurboCAD Pro 2015 [Download] Optimized for 3D Printing - TurboCAD Pro both reads and writes STL files, the standard in 3D Printing world. TurboCAD Pro 3D printing features include surface simplification controls and a 3D Print button for 3D Systems printers Parametric Constraints  TurboCADs constraint manager gives you greater control and productivity. With constraints, you can create parts faster, and have the flexibility to evaluate different designs with ease. Lighting & Materials - A material editor, along with a complete library of materials, is included with TurboCAD to define physically accurate materials, including reflective surfaces with ray tracing and radiosity. Software Developers' Kit (SDK) - TurboCAD's SDK lets you extend the functionality of the application with the ability to develop new tools, functions, plug-ins, and behaviors.