thingiverse
I couldn't find a make with an exact 108 degree interior angle. This is a triangle with an interior angle of 108 degrees. It comes as 5mm high and I made it as a jig for a dodecahedron I was working on. This served as the angle for each side, just increased the x/y to what I wanted which was 150mm
Direct link to the original creator's page
prusaprinters
thingiverse
thingiverse
thingiverse
thingiverse
thingiverse
thingiverse
thingiverse
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.