Original build : http://www.bluefish.net.nz/2015/06/zmr-frame-mini-tricopter.html
The next upgrade planned either on the current frame or on a new one is to use the David W mold injected motor mount which I now have (super fast shipping, and excellent quality) with the recommended Turnigy TGY 210DMH servo.
Two reasons for this is the extra strength and no need for a servo horn as the server slots straight into the molded motor mount.
I had to design a new servo holder as the TGY210DMH is very different to the other servo I used. The tail part of the design stayed completely the same.
All 3D files for both options found here : http://www.thingiverse.com/thing:889866
Here are a few shots of the redesign using the motor mount from davids tail kit and the TGY 210DMH servo.