We envisioned printing a porous plug from ABS which would allow solutions to flow through a high surface-area interior. The plug would require channels with walls sufficiently thick to withstand solvents -both swelling effects and dissolution of the polymer. The type of 3-D printing technology used in this work is Fused Deposition Modeling (FDM), referred generally as 3-D printing in this work, which melts thermal plastic polymer material filament and extrudes the material from a nozzle to deposit material on a building plate. The plug was 3-D printed from both conventional ABS filament and carbon-fiber reinforced ABS filament, producing a plug with a hexagon lattice (Figure ). Both materials are printed using 255℃ nozzle temperature and 100℃ build plate temperature. The lattice matrix was printed with a helical sweeping twist along the axis of the plug and the helical sweep pattern is designed to be 360 degrees over 107mm length. For the ABS printed lattice, the printing process uses a 0. In order to expose the plug interior to H2SO4-SO3, we found it best to draw the fuming sulfuric acid (20% free SO3) up through the plug using a vacuum (applied to the top of the plug).