In　this　paper,　biomimetic　continuous　fiber　reinforced　composite　structures　were　modeled　and　printed　on　the　basis　of　variable　distributions　of　fiber　orientation　and　the　fiber　volume　fraction,　which　are　similar　to　the　wood　structure　in　the　vicinity　of　a　knot.　The　variable　distributions　of　curved　fibers　in　the　variable　stiffness　composites　(VSCs)　without　gaps　and　overlaps　were　realized　during　the　3D　printing　process　by　the　control　of　positioning　a　nozzle　and　the　adaptive　feed　of　plastic.　To　demonstrate　efficiency　of　the　modeling　method　and　the　3D　printing　process,　a　VSC　plate　with　a　hole　under　tensile　loading　was　designed,　printed　and　tested.　The　results　of　tensile　tests　showed　that　the　main　failure　of　the　composite　plates　occurs　far　from　the　hole.　Furthermore,　numerical　and　experimental　strain　fields　obtained　by　the　finite　element　method　and　digital　image　correlation,　respectively,　are　similar.　The　efficiency　in　fiber　savings　for　the　composite　plates　was　improved　by　the　change　in　reinforcement　from　unidirectional　fibers　to　curved　fibers　adapted　to　heterogeneous　stress　fields.　©　2022　Elsevier　Ltd