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@osmanoney said:

I'm modeling for 3D printing. by the way, i am a new sketcup member, i am a student, i am just learning. thank you for your answer.

Since you are new to SketchUp, I would suggest that you spend some time learning to use the basic tools. That will make it easier for you to create the models you want.

If you read the first post in this thread you will see the author's warning that the gears drawn with this extension will not be accurate enough for 3D printing.

Again, please correct your forum profile. You must be using SketchUp 2023 Pro if you are able to use extensions.