This is a super simple micro-servo gimbal designed for use with the with the GoPro Hero 3 and Hero 2.
The micro-servos press into their parts and are screwed in through the back. There is a small slot for the arms that allows you to embed the connections with hot glue. There is a also a hole through the pieces allowing you to screw in the servo arms to make a strong connection.
It has no trouble lifting and controlling the Hero 3 and feels very stable. I've made it very generic to allow you to use any camera that can fit. I tried to make it compact and light as possible.
The top plate for connecting to your quad can be modified however you like, I recommend drilling out holes before attaching so you don't split the print.
I plan on using it for my 330mm quadcopter, but it can be adapted to any use!
I used adafruit micro-servos: https://www.adafruit.com/products/169
Print at 20% infil.
You'll also need hot glue or epoxy to attach the servo arms to the subsequent piece. Remember to put your servo at 90deg before attaching the arms to allow full rotation. (left: 0 - 90deg right: 90-180deg)