We injection mold plastic parts in small quantities of 100, one thousand, ten thousand, at a time. Molding
is a mass production process normally used to make millions of parts, and to do that you need fully automatic hardened steel tooling (molds) that cost tens or hundreds of thousands of dollars each.
We build small hand molds from aluminum that cost a few hundred to a few thousand dollars, and we've been doing it since 1974. The parts are just as good, and if you decide the part design needs a little tweaking, mold changes are pretty reasonable. We mold almost any plastic, nylon, polycarb, noryl, ABS, acrylics, propylene, elastomers, etc.
We often make a mold for the prototype and then produce in batches of 100 or 1,000 from it.