Consumer-to-manufacturer (C2M) is a model connecting manufacturers directly with consumers, which removes logistics, inventory, sales, distribution, and other intermediaries and thus enables consumers to buy high-quality and low-price products. The new paradigm of C2M is equivalent to product-level Industry 4.0, an interdisciplinary research area of robotics (computer-aided manufacturing) and computer graphics (computer-aided design) that represents major social progress, satisfies individual needs and improves production resource utilization. We start from building C2M systems, applying them in simple products such as LEGO bricks and clothes. Meanwhile, we are also interested in several critical manufacturing processes, such as appearance coloring, defect detection, and flexible assembly. Moreover, we have been working on C2M architecture design and system simulation to define and verify the fundamental rules for complicated multi-robot and multi-human collaboration, both of which may help optimize the end-to-end system performance. Collabrating with our industrial partner, we are achieving the smart automation of the end-to-end system from the user side to the manufacturing side. The subsystems are deployed in factories, improving design efficiency by 20% and quality inspection accuracy by 3%, realizing customized brick mass production and achieving nearly ten million RMB in sales in the first year.