About this 3D model

I needed a key release for my keychain. I saw this one: http://www.thingiverse.com/thing:36661 and used it as inspiration to design my own from scratch. His is probably better, but I thought I'd put this out for the world as well. This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/6Wy06QeSNOH