A Chicago-area modeler of the Rapid Transit, in O Scale, had some Sterns and Ward couplers (a type used in rapid-transit applications to automatically make electrical connections) made up with 3-D printing.

It is now possible to print some shapes in brass.

It's not yet possible to print the electrical connection boxes integral with the couplers, and the expense is greater than that of couplers printed with plastics.

Scratchbuilding may never be the same again.

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