When thinking about 3d printers, consider that their value is not just the components that you can print directly but also the ability to print wax dies for metal casting.
Essentially, you print a wax die then cast it in plaster, use a kiln to melt out the wax and then you can use the cast to produce an item in a metal. Aluminium for instance relatively easy to cast in a garage or small workshop.
The cool thing, imo, is in the sharing of open source designs rather than quality of product produced by the printer itself.