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. These are three pieces that can be used for scatter terrain.
All are on hex sized bases. 6mm infantry figure shown for scale.
For all of my buildings, I recommend 1.2mm wall thickness. I design them to be “acceptable” at .2mm layer height for FDM printers.
This shouldn't require any supports and even a brim shouldn't be needed.
The author hasn't provided the model origin yet.