This is a relatively straight forward instructable on how you can make your first 3d printed round open cuff bracelet and print it on your home 3d printer or through a service such as Ponoko, i.materialise, Kraftwurx or Shapeways. I will be 3d printing on my Afinia H-Series 3d Printer.
You should also have a basic understanding of 3d modeling but I will be walking you through my process. The concepts and techniques are not difficult to understand. You can also use any modeling software such as 3ds Max, Maya, or free alternatives such as Blender, Sketchup, Autodesk 123d, and any other programs of your choosing. I will personally be using 3ds Max.
You'll also want a few measuring tools such as digital calipers and a fabric tape measure. The calipers will help you accurately measure in mm for 3d printing and the fabric tape measure can measure the length of your wrist. You'll need to convert those measurements (inches/cm) to mm. You'll always be measuring when designing for 3d print!