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.
I tinkered with the file a little, I added built in rail buttons, eliminating the need to either print thingiverse rail buttons or buying them, as well as eliminating a nut and screw. I know that not having the metal support of a center screw might be an issue, but I made up some for that by making the rail button an oblong, to give more body for strength. I am attaching the solidworks and STL files.