a normal xyz 20mm calibration cube but with a city on the inside —

Founded a normal xyz 20mm calibration cube but with a city on the inside models & stl files for printing
Space Shuttle Bookend
StarrySkies
FTC spintakes
Matthew Temkin
Logo Pioneer
TomasH
Jufureh Statue
Make3D Company Limited
XYZ Test Cube 20mm
Oscar Padilla