SMARS version 1, version 4 (lite) created by Kevin Thomas.
I originally saved a link to Cults 3D where I saw similar interface to Thingeverse and the download button. But that doen't allow you to take the files. And then I noticed that in one year the creator has made 3000 euro selling this model by 5 euro for the zip. Looks like a good business model for hobby.
But I'm a guy from Soviet Union, which means I am okay to spend some time and create my own version, because engineering is in my blood. Here's helpful design walkthrough from Kevin McAleer.
Similar tank from Japan.
Quad pod version of SMARS. Compare with another small quadruped robot.