RCTimer Trooper Y6 alternative motor mounts

This is an alternative motor mount for the RCTimer Trooper Y6 multicopter, designed by user *frj79* in the Trooper thread on [rcgroups.com](http://www.rcgroups.com/forums/showthread.php?t=2242520). I helped with the printing and thought others might be interested in the STL file as well.