208 FLEXI-NODE 1 Full-scale prototype via Flexi-node Ali Baghi Molana Institute of Higher Education Aryan Baghi Iran University of Science and Technology Saleh Kalantari Cornell University An Adaptive, Programmable Mold to Digitally Fabricate Grid Structures’ Joints 1 ABSTRACT This paper is part of an ongoing research project on fexible molds for use in concrete fabrication. It continues and advances the concept of adjustable molds by creating a fex- ible system to produce a variety of concrete grid-joints. This reusable and adaptive mold streamlines the process of fabricating inherently diverse nodal joints without the need for cost-intensive mass-customization methods. The paper also proposes a novel way to cope with some of the signifcant drawbacks of similar mold techniques that have been explored and found wanting in similar projects. The technique used for the mold in the current research is inspired by a fexible mechanism that has been implemented in other manufac- turing contexts, such as expansion joints and bendable straws. The outcomes of the project are a platform called “Flexi-node” and relevant software components that allow users to computationally design and fabricate a great variety of concrete joints for grid structures, using just one mold, with minimum material waste and no distortion from hydrostatic pressure. Keywords: fexible molds, nodal joints, computational design, concrete fabrication, mass customization, grid structures