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Form, process and material tend to be considered as independent or separated entities in modern design theory. This research explores the integration of parametric design with a paste-based 3D printing process. This integration intends to enable creative and holistic design inspired by nature. For that purpose, the research simultaneously develops, in a feedback loop, parametric modelling with the development of a machine to produce the shape in past-like material. The research develops a customized paste extruder to integrate the design algorithms and the machining processes. The authors test the methodology in a DIY, hands-on, empiric design integrating digital manufacture and handcraft craft, developing a customized parametric clay component, baked and glazed at a 1:1 scale for a future pavilion.