Choosing the right gear type depends on your project's load, speed, and noise requirements. STLGears.com | The Free Gear Designer
Then, the light died.
Depending on your skill level and software of choice, here are the most effective ways to generate gear STLs today: SOLIDWORKS
: Backed by standard gear design principles, this script utilizes custom parameters on MakerWorld to generate spur, ring, crown, bevel, and worm gears. 3. CAD Integrated Scripts