In　this　paper,　an　improved　re-entrant　metamaterial　based　on　3D　printing　was　proposed,　which　exhibits　enhanced　stiffness　and　vibration　suppression　ability　compared　to　the　original　metamaterial.　The　proposed　metamaterial　allows　for　intentional　adjustment　of　the　bandgap　by　incorporating　metal　pins　of　varying　sizes　or　weight　into　the　ring　structures.　Furthermore,　the　addition　of　particle　damping　inside　the　rings　enhances　the　design　flexibility　of　the　bandgap,　enabling　customization　of　the　middle　and　low　frequency　ranges.　Experimental　and　simulation　comparisons　are　conducted　to　evaluate　the　static　properties　and　vibration　suppression　ability　of　the　metamaterial.　The　results　demonstrate　a　172.4　%　increase　in　load-bearing　capacity　and　a　significant　improvement　in　vibration　suppression　of　the　proposed　metamaterial　relative　to　the　original　configuration.　The　vibration　suppression　of　the　proposed　metamaterial　can　be　further　enhanced　by　introducing　particle　damping　into　the　metal　tube,　and　the　vibration　suppression　frequency　can　be　intentionally　adjusted　by　changing　the　dosage　of　particle　damping.　This　research　presents　a　novel　approach　for　the　design　and　optimization　of　metamaterials.