Yes there's a few threads about the 3D printers, but the plastics available for them right now hasn't held up to more then a few rounds.
I think if someone can figure out a cheap way to make a home injection molder would work, the plastics that will hold up for these is easy to get but it comes in pellet or ball form.
Maybe a wood mold will work since your most likely only going to make a few for yourself, and metal pieces can be added to a few important areas.
The hard part is making the injector part, it needs to heat up enough plastic to fill the entire mold in one shot.
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