This is a remix of m3 hex bolt cap by PfRohles. The original design has a chunk missing out of it and the second revision did not have a way to actually attach itself to the bolt. So I tweaked it a little to not have the chuck removed.
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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 Thingiverse page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.