Modern Robots Sensor to FTC Tetrix

This is a basic Modern Robotics sensor holder for the Tetrix standardized pieces. There was another much like this, except this one can also be mounted on the inside of the channel, which is what our team needs.

After Post Update 1 1/4/2017: One side of the mount was too long for it to accurately fit how I wanted it to. Fixed
After Post Update 2 1/4/2017: I accidentally saved as "all selected geometry" and didn't have any selected, which led to an empty STL file. Fixed