Definition and application of process tools for rib structure de-sign in Large-scale additive manufacturing

This paper introduces an innovative approach to large-format robotic additive manufac-turing (LFRAM) by implementing a parametric point array patterning (PAP) method within Rhino Grasshopper. Unlike conventional slicing algorithms that convert 3D models into layers, the pro-posed solution generates toolpath sequences directly from parametric models. The method-ology leverages integrated Grasshopper components to create customizable ribbed structures with adjust-able dimensions and spacing, offering enhanced flexibility for large-scale applications. Experi-mental validation was performed using a FANUC M-20iB/25 industrial robot equipped with a pellet extruder, with PETG selected for manufacturing a structural component measuring 1500 × 100 × 60 mm. The research was conducted within the PROMATAI project during the rapid prototyping of the Adjusted Grooved Feed Section of the extruder (WP2).