An additively manufactured combustor shell may comprise a radially outward surface, a radially inward surface opposite the radially outward surface, and an injector port defining a fuel injection channel. The injector port may comprise an inlet structure extending from the radially outward surface, and an outlet structure may extending from the radially inward surface. A support structure may extend between the outlet structure and the radially inward surface. The support structure may be configured to vaporize upon ignition of a fuel within the combustion chamber.