Export to stl...Slightly off coordinates

Hi all,

I’m new to Rhino. I’ve noticed that the STL file exported from my 3DM file contains vertices with 9 or more decimals, such as 3.120000001, even though I set the tolerance to 0.1 m during the export. I observed the same issue when I increased the display precision to show more digits after the decimal in my original 3DM file. The surfaces are becoming non-flat due to this “noise.” Is there a way to export the STL file so that all vertices have only 2 digits after the decimal? I attached my 3dm file to this post. Thanks for any help.
steps.3dm (391.4 KB)