| 摘要 |
<p>A head assembly for an extrusion-based 3D printer includes : a fluid-dispensing head having a manifold and at least two fluid-dispensing nozzles, as of different sizes, which are mounted in communication with a melt chamber in a manifold. Outlets of the nozzles are each closed by a respective valve member. A rocker serves both to pivot the nozzles to their lowermost nozzle-operating position and to actuate the valve members, allowing ready switching between the valves, such that the small nozzle can be used for high resolution work, and the large nozzle for bulk infill.</p> |
