This new version is a paid 3D model (and it includes STEP files, thankfully) but the original proof-of-concept print-in-place tank chassis is free and remains a highly clever piece of design that ...

If we told you somebody built a 3D printed go-kart ... Thus, [3D Sanago] used foam boards to cover much of the chassis. The build recreates the kart from the KartRider Rush+ game.