grabcad
Universal coupling consists of two forks keyed to the end of the two shafts. A central block consisting of two cylindrical bushes cast or welded, is placed between the two forks and connected to them by two pins.
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This STL file 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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Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original grabcad page to see if modifications are permitted by the creator.