What potential does 3D printing have for developing economies?

Can 3D printing combined with mobile internet access enable developing economies in Africa and elsewhere to create a new manufacturing model that overcomes their deficit in traditional manufacturing infrastructure (roads, transportation, logistics, finance etc.) and constrained development to-date?

Could we be on the verge of a lower cost and way more flexible model ideally suited to under-developed regions where on-site and one-off manufacturing provides scarce spare parts for products manufactured elsewhere and a new generation of local products specifically designed for local needs?