GrabCAD
Japanese swords are considered a piece of art, you can see I did this project before, but I wasn't satisfied with the resalt because the shape and the dimensions weren't accurate enough. so, I did it again with better understanding of the katana and this time with multi body Techniques so it's one part file
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This model is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Check the license (see original page) on the original GrabCAD page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.