Continuous　fiber　reinforced　thermoplastic　composite　(CFRTPC)　auxetic　honeycomb　structures　were　fabricated　using　the　3D　printing　technology　with　a　specific　printing　path　planning.　For　comparison,　auxetic　honeycombs　were　also　fabricated　with　pure　polylactic　acid　(PLA).　In-plane　compression　tests　were　conducted,　with　corresponding　damage　types　explored　using　Scanning　Electron　Microscopy　(SEM)　images.　A　printing　path-based　finite　element　(FE)　method　was　developed　to　mimic　both　small　and　large　deformations　of　CFRTPC　auxetic　honeycombs,　while　analytical　model　was　proposed　to　predict　their　effective　stiffness　and　Poisson　ratio.　Good　agreement　was　achieved　among　analytical　predictions,　FE　simulation　results　and　experimental　measurements.　A　systematic　parametric　study　was　subsequently　carried　out　to　quantify　the　dependence　of　in-plane　mechanical　properties　on　geometrical　parameters.　Compared　with　pure　PLA　structures,　the　presence　of　continuous　fibers　efficiently　prohibited　crack　propagation　in　the　matrix　for　each　ligament　of　CFRTPC　auxetic　honeycombs.　Adding　continuous　fibers　increased　the　mass　only　by　6%,　but　led　to　dramatic　increase　in　compressive　stiffness　and　energy　absorption　by　86.3%　and　100%　respectively　and　smaller　Poisson　ratios.　The　proposed　3D　printing　technology　has　great　potential　in　integrated　fabrication　of　continuous　fiber　reinforced　composite　lightweight　structures　having　complex　shapes,　attractive　mechanical　properties,　and　multifunctional　attributes.　©　2020　Elsevier　Ltd