About this 3D model

I made this a couple years ago on Autodesk inventor it is an ambiguous cylinder. From one angle it appears to be a cylinder but when you spin it 180 degrees horizontally it appears as a rectangular prism. It is not anything new but just thought I'd share the .STL file. **WARNING** When opening the .STL file it might appear small and laying on the side, to use the least amount of support print vertically and scale to the desired size.