thingiverse
Plastic rivet for the cars engine splash shield, etc. Made this 6.5 mm in diameter and 12 mm long for a Toyota Avensis. Same type of design as: http://www.thingiverse.com/thing:264957 but needed a larger head. Use a 10mm M3 or similar (hole diam. 3mm).
An original rivet (broken) is seen to the right in one of the pictures.
Instructions
Use 100% infill and preferably a slower extruder velocity, 50 mm/s.
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
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 thingiverse page to see if modifications are permitted by the creator.