There isn’t any method of taking up slack in the track and a ripple ... as it drives, but the tank is small enough that it doesn’t seem to mind much. STL files and source code is available ...

[rctestflight] was playing around with 3D printed rover gearboxes, which morphed into a 3D printed tank build ... gearbox and tracks afterward. All the STL files are up on Thingiverse, but ...