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I think for a business it is an issue of starting investment. Injection plastic molding, like with the WWSD, requires injection plastic molding machines, molds, supporting hardware (cooling, thermal controllers, material feeding setups, some method of robotic takeout system), and technicians familiar with various parts of the molding and automation process. 3D printing can be done to fill orders and with a lot less up-front investment in hardware. If it goes bust, the cost of 3D printers is way lower of a loss.