The Printrbot, which was the very successful 3D printer from Kickstarter, is both affordable and good quality. I've seen people print working KEYS with them.
So DIY is possible in the 500-600 range. Really what's most expensive are the electronics and motors.
How about a Pizza Printer? Add 4 cartridges, one full of cooked flour, one with tomato paste, one with vegetable/meat paste and the last one with cheese. With some development this will soon hit the market and be common as microwave ovens! Thought of this after seeing an exhibition of 3D printing by sudents at UCL, London.
This is simply a suggestion/idea. I do not have development facilities to produce even a prototype. Someone who is able to build a proptotype and go into mass production will make a fortune, I believe!
