The factory floor at Forecast 3D in Carlsbad features a dozen HP model 4200 additive manufacturing machines. The 3-D printers can build an object roughly 1-foot-square out of nylon. The printing process takes up to 10 hours. Photos courtesy of Forecast 3D

The factory floor at Forecast 3D in Carlsbad features a dozen HP model 4200 additive manufacturing machines. The 3-D printers can build an object roughly 1-foot-square out of nylon. The printing process takes up to 10 hours. Photos courtesy of Forecast 3D

— The new face of manufacturing in San Diego County sits inside a low-rise building at the end of a cul-de-sac next to McClellan-Palomar Airport...

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