摘要：
Creating a thin walled sintered component 1 from subcomponents 10 using binder jetting additive manufacturing; the sub-components having an outer surface 20 including one or more protruding portions (22, fig 6, 24, fig 6) having one or more bonding faces 26 to interface with neighbouring sub-components; heating the sub-components (104, fig 5); assembling them (106, fig 5); and heating the assembly (108, fig 5). Each subcomponent may have a first end (12, fig. 6) and second end (14, fig. 6), an inner surface (40, fig. 6), and a first passage (42, fig. 6) between ends, and second passage perpendicular through the recessed portion defining a cavity (30 fig 6) in the sintered component between sub-components. The sub-components may be partially debinded before the second heating step, a bonding material e.g. powder or foil may be provided at the interfaces, a compressive force may be applied during the second heating step e.g. by gravity or different thermal expansion. The sintered component may be polygonal cells, e.g. a heat exchanger core, and may include protrusions (25, fig. 8) increasing surface area or adjusting fluid flow. The use of binder-jetting is designed to allow smaller details and powder removal prior to assembly, and the placement of voids between sub-components.