Flexible　sensors　modified　with　microstructures　possess　excellent　high　sensitivity　and　ultralow　detection　limit.　In　this　study,　silver-coated-glass　fiber-filled　silicon　rubbers　with　their　net　structures　were　3D　printed　and　designed.　Porous　structures　were　introduced　through　the　multi-layer　printing　of　the　net　structure.　The　high　conductivity　of　the　printed　composites　originated　from　the　conductive　fillers,　which　assure　the　composites　applied　in　circuit　connection.　Flexible　capacitive　sensors　were　further　fabricated　with　the　porous　composites　as　electrode　layers　and　the　flat　polyethylene　terephthalate　film　as　the　middle　dielectric　layer.　The　prepared　capacitive　sensors　owned　an　excellent　sensing　property　to　detect　ultralow　load　with　a　sensitivity　of　0.0666　kPa-1.　The　evolution　of　the　porous　structure　was　schematically　described,　when　the　capacitive　sensors　were　compressed.　The　net-structured　porous　capacitive　sensors　fabricated　with　3D　process　would　inspire　us　a　new　branch　in　the　printing　electronics.　©　Published　under　licence　by　IOP　Publishing　Ltd.