I was going to look at the Bit Builder, under Project in ARC and the link to the " - STL Design Files and specifications for EZ-Clip, EZ-Robot Servos, EZ-B and other parts" is wrong as the hard coded link is: http://localhost:80/Community/Revolution/DesignFiles.aspx

The external link I believe would be: https://synthiam.com/Community/Revolution/DesignFiles.aspx

Just as an FYI.