thingiverse
This is a basic 8" ruler. There are two files for this make. The first, the basic ruler, has slots so you can use a mechanical pencil to draw small lines for marking measurements and it allows you to see llines at that mark. However, the first one cannot be used as a straight edge tool. So, the secong make, is an edged ruler. It closes the gap between the measuring marks. You do not need to print both. choose whichever is more conveniant for your purposes.
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.
Yes, this model is available as a free download on thingiverse. Some creators accept tips or donations.
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.