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.
As far as selling them, no. You are free to make them, modify the design, (be sure to attribute me as the original designer if you mod it), and enjoy the use of them. But all my designs are for non-commercial use, and I feel that selling them would be a commercial use. Sorry.