Your futuristic war machines shouldn't be slogging through swamps and deserts to find their foes. Take it to the streets with the Smelly Old Gamer's line of buildings.
My own original work designed to be compatible with BattleTech and other 6mm Games. In BattleTech map scale, this is 2 Level, 3 hex building.
This is a Work in Progress, but I successfully have printed this on a mini+.
For all of my buildings, I recommend 1.2mm wall thickness. I design them to be “acceptable” at .2mm layer height for FDM printers.
No supports needed if you've got your settings dialed in, but I always use a brim.
The author hasn't provided the model origin yet.