This is a model of a ring I am proposing for a jewelry class we must have a minimum of 3 solders. It is based on a machine part. A simple turbine form with 16 solders. The challenge here is how to polish it.

Scale it then print it off! This actually prints fairly well with the fins doubling as support, it can give you a relatively decent top. Use the source file to alter it or get the dimensions for your own metal version!