Originally produced by Games Workshop for their 6mm scale table top wargame, Epic 40,000 (and precessors/successors). They have since abandoned all support for Epic, so I modeled this in Autodesk Inventor for any avid wargamers.
I haven't tried printing this model in an FDM printer so I can't recommend settings or methods of optimization.
Epic has been re-released as a titans-only game called Adeptus Titanicus. It is 8mm scale instead of 6mm, so I suggest that anyone wanting to print this for AT scenery or to play 8mm Epic should upscale it by 133%.