When I export my plan to a stl, I get this weird triangular structure in one of the rooms.

[specop]

When I export my plan to a stl, I get this weird triangular structure in one of the rooms. Any suggestions? See attached

 

Thank you

aaa.stl

[Kbird1]

I don't have a 3D Printer or know much about it but have read here a few times that Chief's STL Models are "leaky" and may need "fixing" with a Mesh Repair Tool like Meshlab

 

http://www.meshlab.net/