Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) offer remarkable porosity and chemical tunability, yet their integration and shaping into binder-free, mechanically robust, and porosity-retaining architectures remains an issue. Here, we introduce reactive direct ink writing (RDIW), an additive-manufacturing strategy that utilizes the intrinsic thixotropy of high-aspect-ratio MOF nanorods to create printable inks without any polymeric binders. After extrusion of the ink into a bath of COF monomers, rapid imine condensation produces a continuous COF sheath around each filament, forming core-sheath MOF/COF aerogels that preserve the microporosity of both components. We demonstrate that this approach is general across multiple MOFs and four imine-linked COFs and produces wood-pile structured monoliths with tuneable composition and architecture. The 3D-printed aerogels exhibit over 4 times higher initial rate of adsorption h 0 than MOF, COF, or sol–gel-derived MOF/COF analogues, while maintaining structural integrity and recyclability. RDIW establishes a scalable framework for shaping porous crystalline materials into mechanically resilient, high-surface-area monoliths, opening new opportunities in water purification, separations, and catalytic flow systems.