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One of the big names in the CAD application industry is AutoDesk. While much of AutoDesk’s professional-level products are only available for purchase, the company has created a number of free CAD applications that can be used with 3D printers. AutoDesk offers 123D Design to users as a fast and easy tool for creating 3D objects that can be immediately sent to a connected 3D printer. But don’t ignore the company’s other free apps. 123D Creature and 123D Sculpt are two iPad apps that let users create custom objects on an iPad that can be saved and printed. 123D Catch lets users take a number of photographs of an object (from various angles) and then converts it to a 3D model that can be tweaked and then printed. Finally, 123D Make can take a model and slice it into layers that can be cut out in wood, plastic, or cardboard and then assembled.