An interesting STEAM education aid tool that shows the Earth orbiting the Sun and the Moon orbiting the Earth. All the rotational precision of the gear chain is within 1%. You can select the rotation speed between 1 and 4 and observe the changes in the rotation/orbit speed. I recommend applying a little grease to each bolt/shaft to make it easier to rotate. Pay attention to the tightness of the nut fixing on the bolt, as it may cause sticking if it's too tight.

The bracket includes an optional cavity for adding clay to increase weight. Print the cavity and the bracket side by side, then insert a pause, fill it with clay, and insert the parts. If you don't want to do this, just enable support on the bracket, and the void will be filled in.

If you have any questions about the assembly, please let me know. I have indeed attached a cross-sectional image for your reference.

Filament - Pla+

Filling material - 15%

Nozzle temperature: -210℃

Bed temperature -60℃

Support - None

Bed adhesion - Brim on the planet/sun

Floor height - 0.2mm