The number of freeform buildings has been continuously increasing, serving as a landmark representing a country or a city. However, most of the freeform buildings have been built with conventional construction methods and required a tremendous amount of construction cost. This study seeks to apply additive manufacturing technologies to the freeform concrete formwork. Among many additive manufacturing techniques, the study focuses on the Laminated Object Manufacturing (LOM) method because of its advantages on building speed and cost. Also, the LOM technique is modified by using sloped angle at the side surface of the laminated layer (called Sloped-LOM or S-LOM), which yields great increase in the accuracy. We built a new FreeForm Formwork 3D Printer (named F3D printer) using the new approach. The F3D printer consists of a 5-axis laser cutting device for sloped cutting of EPS (Expanded Poly-Styrene) sheets with high speed, an auto pallet changer for EPS feeding, and a palletizer for EPS loading. This paper introduces the S-LOM method and the F3D printer, and the comparisons of the outputs from the conventional method and S-LOM method through actual formwork production.
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