A low profile light battle tank, it's my own random design borrowing pieces of an S-tank, an Armata, and maybe some of the light tank from Command and conquer renegade.
There are two versions here, a rare earth magnet version that is designed to have 1/4in x 1/16in disc magnets glued in little spaces between the turret and chassis, I got mine to fit with a lot of trial and error but can't promise anything to fit without troubleshooting. The model should be 2.15in on the longest part over a track. You will have to print a test and see if it needs to be adjusted or ream the hole with a 1/4 inch drill bit, then you have a lot more leeway in how it fits and what magnets you use.
The direct-fit one is simpler, it is just held in with gravity, the space I left on mine leaves enough clearance to wiggle a bit, but not spin free, this is all dependent on print settings, again its a trial and error game and you should expect to do some sanding to make them fit to your liking.
I hope that explanation was enough, good luck