About this 3D model

This mechanical worm was super fun to make. I used Tinkercad for the entire thing. Over the course of making this project I ran into several problems. For example, the first time I made this I tried printing the axel seperate and then sliding on the circles, however this did not work as planned. Over the entire project I had a lot of fun designing this and problem solving! Also, I hoped it would be a little smoothe, however I believe this can be solved through some sanding. Here is a video of it working: https://www.youtube.com/watch?v=sZPzQP6lvEs