This was PRECISELY the problem that led me to get a 3D printer. I have successfully printed many gears using PETG for my projects. Now, they are physically b

This was PRECISELY the problem that led me to get a 3D printer. I have successfully printed many gears using PETG for my projects. Now, they are physically bigger than metal gears for the same strength, but that hasn't been an issue in my applications. Using the wishbone-style gear teeth with 3D printing is remarkably sturdy. Of course the other way is: buy motors with (metal) gears that are close to your need - then you only need to 'transform' that motion a little bit. I also can cut involute gears on the (mini-) lathe or mill. You want to practice this skill because being off just a little means you have a useless part. I have found 3D printing more convenient and forgiving.