Ceramics are increasingly desired for high-temperature and extreme environment applications, but traditional sintering methods are high-temperature and pressure and yield limited complexity parts. Polymer-Derived Ceramics (PDCs) are novel modern materials that use reduced processing temperatures and can be manufactured using polymer forming methods such as additive manufacturing. In this work we manufactured SiOC ceramic monolithic structures by Direct Ink Writing of a preceramic polymer containing modifying fillers. Modeled monolithic structures with ordered porosity and dimensions ranging from a few millimeters to a few centimeters composed a preceramic filament that could be additively manufactured, then transformed into a ceramic composite. The preceramic filament with appropriate rheological properties was obtained by the mixing of the liquid preceramic polymer, 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane (TTCS), with ceramic nanoparticles and fibers to generate an extrudable resin. The addition of hexagonal Boron nitride (h-BN) improved the printability of the ink, as well as reduced the shrinkage of the resulting ceramic following curing and pyrolysis. The addition of alternative fillers were intended to further reduce the shrinkage of the structure and improve mechanical properties of the porous SiOC ceramic. The rheology of the ink was evaluated to develop the printing parameters for fidelity to the design. The composition of the amorphous pyrolyzed ceramic and degree of transformation was evaluated using X-ray Diffraction analysis (XRD) after pyrolysis at 1000°C in Air. The morphology of the preceramic polymer with fillers and the resultant printed ceramic was analyzed through Scanning Electron Microscopy, and the roughness of ceramic filament was measured. The structural and functional applications of additively manufactured polymer derived ceramics are also discussed.