Minimum Bounding Box to fit Geometry to Printbed

[Joseph_Oster]

Internalize your geometry? Use longest edge of brep as basis of plane for BBox:

Convert Brep to Mesh | lowest polygon

Just to help you clarify the problem… Your file has one building. What do you expect? [building_2018Feb7a] How about an “oriented” BBox (Bounding Box)? [building_2018Feb7a2] building_2018Feb7a.gh (10.4 KB)