Re: creating your own jewellry line of custom 3D-printed earrings.
I haven't got one, and I make things.
For making useful things, a CNC router is usually more suitable than a 3D printer. Lots of things can be assembled from 2D shapes: shelves, wine racks, stencils, cutting jigs, laptop stands, boxes, chairs, whatever...
After a CNC router, another useful machine is a metal lathe. You can make your own screw threads, which 3D printers often struggle with.
Sooner or later MS is going to link this 3D printing software to their Kinect tools, though there's every chance the open-source community already have done.