Think Tank Tread add-on

This is the Think Tank Tread add-on. Basically I printed out the treads and assembled them all with printed parts and it works very well. I incorporated a rubber band drive so you can pull it backwards and let go. I have a friend who printed them for me. I just entered because I really want a 3D printer more than anything. This is my first attempt in trying the software and really like it but need to get better at it.