Spirograph Gears

12-25-2023 - Note: Some people have said that the “shoulder” on the outer gears interferes with the inner gears. Every printer has slightly different tolerances, so this may not be an issue for everyone. Please know that the shoulder is there to prevent the smaller gears from lifting during drawing. If your gears have this issue, simply expand the z dimension of your outer ring gear slightly then re-slice and reprint. Stretching the Z slightly should not affect how the gears mesh. Please continue to give me feedback! Thank you! This spirograph gear set will provide you and your kiddos with hours of fun and creativity! I have provided 2 “outer ring” gears of 120 teeth and 100 teeth. Then I have 8 circular gears and 2 elliptical gears all with varying sizes and numbers of teeth. One thing I learned while doing this is that designing and using spirographs is a very mathematical endeavor. The pattern that is produced is directly a result of the ratio of teeth in the outer and inner gears.