You've been looking for the "killer application" to justify purchasing a 3D printer? Think about lighting fixtures, the unique ones that can't be found in "big box" stores. A 12 volt LED picture light and invisible wire (metal tape) will cost over $800. A lamp, socket, tape, transformer and plastic to make your own costs less than $30., which leaves $770. to purchase a printer. Install a few of these lights and, well . . .