thingiverse
This is an openSCAD model and STL file of an old timey plotter pen, used in the land before wide-format inkjet printers.
I took measurements of a random sampling of three different pen brands and formats. I'm sure the resulting model would fit in any pen plotter, but if anybody knows of more official pen dimension standards I'd love to hear of them so I can update the numbers.
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.