  This paper presents the initial development of a robotic additive
manufacturing technology based on ultraviolet (UV)-curable thermoset polymers.
This is designed to allow free-standing printing through partial UV curing and
fiber reinforcement for structural applications. The proposed system integrates
a collaborative robotic manipulator with a custom-built extruder end-effector
designed specifically for printing with UV-curable polymers. The system was
tested using a variety of resin compositions, some reinforced with milled glass
fiber (GF) or fumed silica (FS) and small-scale, 2D and 3D specimens were
printed. Dimensional stability was analyzed for all formulations, showing that
resin containing up to 50 wt% GF or at least 2.8 wt% FS displayed the most
accurate dimensions.
