GrabCAD
It is a single spur gear that has 16 teethes & a pressure angle of 14.5 degree. The base circle is 3.5 inch (radius) & inner circle has a dia of 1 inch.
Direct link to the original creator's page
This model is published by its creator on GrabCAD. STLFinder only indexes it: the "View on GrabCAD" button above opens the original page, where the creator shares the OTHER, RENDERING, SOLIDWORKS files under their own license.
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.
Yes, the creator shares it at no cost on GrabCAD. Some creators accept tips or donations.
Check the license (see original page) on the original GrabCAD page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.