Before you can print an object, you need to have a .stl or .obj file of a 3D model. There are a number of CAD software programs that you can use for free and that are especially good for beginners. Before you begin designing, we recommend you read this short tutorial about some of the design concerns you need to keep in mind when designing for 3D printing.
3D Design for 3D Printing: http://www.instructables.com/id/3D-Design-For-3D-Printing/
Browser-based software (no download required):
Free to download:
Silhouette Studio (for Silhouette vinyl cutter)
Cura (software specific to the Ultimaker 2 3D Printer)
There are many helpful tutorials in Lynda.com.
For the beginner, we recommend:
Up and Running with 3D Printing
and/or
For intermediate users, we recommend:
