The　advancement　of　hydrogel-based　epidermal　sensors　that　integrate　multifunctionality,　high　transparency,　rapid　processing,　and　heightened　sensitivity　is　of　significant　interest.　Herein,　we　present　an　efficient　approach　for　the　fabrication　of　flexible　dual-mode　epidermal　sensors　through　the　ultraviolet　(UV)-curing　3-D　printing　of　polyacrylamide　(PAM)-based　ionic　hydrogels.　The　hydrogel　precursor　incorporates　sodium　dodecyl　sulfate　(SDS)　monomers　to　augment　the　water　dispersibility　of　the　2,4,6-trimethylbenzoyl-diphenylphosphine　oxide　(TPO)　photoinitiator,　thereby　substantially　increasing　the　photocuring　efficiency　of　the　ionic　hydrogel.　As　a　result,　the　distinctive　surface　microstructures　of　PAM-based　ionic　hydrogels　can　be　engineered　for　sensors　with　varying　sensing　modalities　to　improve　detection　performance.　The　piezoelectric　tactile　sensor,　incorporating　a　concentric　ring　microstructure,　demonstrates　a　sensitivity　coefficient　of　1.39　mV·kPa-1.　Conversely,　the　resistive　strain　sensor,　characterized　by　a　high-density　reticular　hollow　structure,　exhibits　the　highest　gauge　factor　of　24.87.　Furthermore,　each　sensor　modality　demonstrates　excellent　temporal　response　and　stability,　confirming　its　applicability　in　motion　monitoring　and　Morse　code　transmission.　©　2001-2012　IEEE.