In summary, we have used 3-D printing to fabricate a porous cylinder using an ABS filament material. We have carried out a chemical modification of the printed structure using H2SO4-SO3 (fuming sulfuric acid) and IR spectroscopic analysis provides evidence for the incorporation of sulfonic acid groups. The ABS-SO3H and ABS(CF)-SO3H printed catalysts have been shown to be effective in promoting a variety of acid-catalyzed synthetic transformations.