MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Sketchup must be set to inches and the files you downloaded comes in in mm so it times it by 25.4? Not 100% sure. I never have to scale anything off of thingiverse so it must be how Sketchup is bringing the file in. See if you can switch it fromm inches to MM. not 100% sure.