If you wanted to build a case or a part for a single board computer, I thought that this video might be helpful:
How to- home injection molding
http://www.youtube.com/watch?feature=pl ... -g-SJ-P9WgSo then I started looking and I found something more realistic for home hobbyists who don't want a one or two ton press in their basement:
Home or Hobby Plastic Injection Molding Machine
http://www.youtube.com/watch?feature=pl ... D-kCf8amHkAnd while you will probably need a CNC machine or a drill press to make the molds, you can actually buy a smaller product from here or find one on your own:
http://www.techkits.com/http://www.techkits.com/pim/index.htmThis would help you make your own parts or molds using plastic. That's it.
(Unfortunately, they only ship to the U.S. and Canada as their website says they don't do international shipments. Maybe they will reconsider in the future.)