Anet A8 608 Y belt tensioner

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/aUu3O8iUahu

608 bearings are very popular and very good quality ones are quite cheap. So I took CH35C0's design and used the screw and plate. The rest was done by me. I designed the the main structure with curved edges for smoother running and 608 bearing axle to locate smoothly.