Scaling problem with slicer software

[TFilbert]

Thanks for the input. It could be the wall thickness of the bottom of the cylinder, which I think I modeled at 1/8" 7.125 = 180.975mm But, What I don't understand is why the shift at all in the decimal? The dimensions in the photograph are the dimensions the part imported with, which shows mm, not cm. If it was in cm I would have been less confused. And I didn't understand what was happening when I "scaled inches to mm" and the part exploded in size. What slicer program should I look into? I wasn't sure if I could use any slicer, or if I need to use theirs because it's modeled for the print bed/space of their printer.Attached is the .stl