The two larger gears are attached to the sides, and the two smaller gears are attached on the lower part of the toy.
In order to make the two larger gears rotate in the same direction, I put one extra gear, which reverses the movement of the existing lower gear.
The tricky part about making gears was that you need to be extremely meticulous when you have to decide how many teeth you use for one gear, at what angle you would cut each tooth, and how to position the gear next to one another so that none of the teeth would get jammed up.
I’m still deciding how I’m going to utilize the two larger gears to make a different type of movement other than just “rotation.” Anyhow this is what I have so far.
Video attached below.