Follow the official blog post:
The assembly is easy, there is not much to describe. You need to 3D print the files. Add supports when printing the sheep.
Later click the sheep on the spool frontage, use super glue if needed. Remember to place them there at the exact positions as shown in the picture, otherwise, the hexagon pins will not match the hexagonal pattern. Insert bearing into the bottom and top part and slide both parts onto the rod. Push the spool with the sheep on the top. And that it is!
Now comes the harder part – the zoetrope effect can be recorded if your shutter speed matches the spinning speed. To test it, just start recording and spin the zoetrope with hand. When it will be slowing down you will experience the effect for a second. But it is amazing. Feel free to adjust the zoetrope with a stepper and transfer gears to have a constant speed which you could easily match the camera shutter.