3D　printing　is　an　advanced　technology　that　has　been　used　in　biomedical　and　automotive　engineering,　and　has　raised　a　significant　response　in　civil　engineering.　Wire　and　arc　additive　manufacturing　(WAAM),　a　metal　3D　printing　technology,　has　prospective　applications　in　steel　construction　because　it　can　fabricate　large-scale　structural　members　at　an　acceptable　cost　and　manufacturing　efficiency.　Fundamental　studies　are　still　urgently　needed　to　realize　its　engineering　application.　However,　due　to　the　irregular　geometric　features,　limited　studies　on　the　structural　performance　of　WAAM　components,　particularly　the　numerical　studies,　have　been　carried　out.　To　this　end,　a　numerical　investigation　on　the　local　buckling　of　WAAM　stainless　steel　circular　hollow　section　(CHS)　stub　columns　under　axial　compression　has　been　conducted　and　presented　herein.　The　finite　element　(FE)　models　were　established　and　validated　against　the　existing　experimental　research.　Parametric　studies　were　subsequently　carried　out　to　broaden　the　cross-sectional　resistance　data　pool　using　the　developed　FE　models.　The　applicability　of　the　cross-section　design　provisions　specified　in　EN　1993-1-4:2006　+　A2:2020,　ANSI/AISC　370-21　and　the　continuous　strength　method　(CSM)　for　the　design　of　WAAM　CHS　was　evaluated　according　to　the　experimental　and　FE　results.　Furthermore,　a　modified　design　method　with　improved　accuracy　was　suggested.