Every maker, inventor and engineer knows that 3D printing is great for making prototypes,

3D Printing
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Every maker, inventor and engineer knows that 3D printing is great for making prototypes, but after the prototype is made, you struggle to commercialize those prototypes because 3D printing is too slow and costly for production runs, and the long lead time, high cost and risk of the injection moulding tools prevents quick and easy access to industrial injection moulding processes.

Many-maker solves this problem by enabling you to make injection moulded production runs in record time, right on your desktop using inexpensive mould tools cast in high temperature polymers from mould masters made with your 3D printer.
http://www.3ders.org/articles/20160203-turn-3d-printer-into-a-full-fledged-production-line-with-many-maker-injection-molding-kit.html

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+Peter van der Walt How about this for your next project?

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This article has made me think about redesigning a centrifugal casting machine that I built about 30 years ago that was capable of casting lead, tin, or zinc. I used it to mass produce miniatures for wargaming (Napoleonic era). I think it could be easily adapted to handle resin casting of 3d printed parts. The original design could handle an 8" round mold, but I would like to increase it to handle 12-15" molds. It is a very simple process to create the molds using either RTV silicone or vulcanized rubber (can be done in a standard kitchen oven). I just need to see what types of resin are available that have a quick cure time, with decent strength and wear characteristics.