Core-shell morphology of composite filaments for use in extrusion-based additive manufacturing systems

This invention describes a special plastic string, or filament, for 3D printers. It's designed with an inner core made of a plastic mixed with specific particles like glass beads, glass fibers, or carbon fibers, and an outer plastic shell. When this filament is melted and printed, the resulting 3D object maintains the distinct core-shell structure, ensuring the reinforcing particles remain embedded within the plastic and don't protrude from the surface. The claims specify that these particles must be glass beads, glass fiber, carbon fiber particles or combinations thereof, and can make up 50-85% of the core's volume.