A simple untextured model of a gear that I got no use to.
The second version is modified a bit, mostly to avoid using n-gons, (now it uses just quads) because that's bad apparently.
CC0;Feel free to edit before using.
!!Watch out for the circle in the middle, it might cause some problems with certain (fixed and shortest) modes of triangulation in blender.Either edit or use the other two methods!!
Both models have 400 tris