What kind of parts? Flat parts, such as panels and covers? 3-D objects?
A 3-D printer should be able to do about anything, but i don't think they are cheap. http://www.popularmechanics.com/technology/industry/4224759.html
http://www.popularmechanics.com/automotive/jay_leno_garage/4320759.html
In my junior high shop classes we used to bond together layers of plexiglas and use coping saws, files, etc. to make 3-D objects. I've used my Dremel to modify existing parts or change their function completely.
I am interested in seeing what other people write!
1. Use CAD/CAM software to model the part you want to make.
2. Use a CNC machine to cut the part out of two pieces of aluminum (the mold).
3. Build an injection molder.
4. Fill with melted plastic pellets and inject.
5. ????
6. Profit
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