You already know the first camera support, the fixed one. As the movies were really shaky due to control inputs, I decided to build a real two axis gimbal. The newest KK2 firmware (1.6) is able to run a servo gimbal directly without an additional controller board. You can just use the motor outputs 7 and 8 for the servos and 1-6 for the brushless ESCs. Of course I just use four of them for my quadcopter.
First attempt was to use two nano analog servos from hobbyking (TS541A). The structural parts are all out of my 3D printer. To increase the rigidity I tried to make a tip bearing similar to those you find in H0 model trains. These are working great and have almost no friction. The concept worked very well, but the servos are too cheap ones. They are jittering all the time without reason and had far too much backlash.
Hint: To point a screw, clamp the screw in a drilling machine or lathe and use a dremel/proxxon tool to grind it pointy.
First attempt was to use two nano analog servos from hobbyking (TS541A). The structural parts are all out of my 3D printer. To increase the rigidity I tried to make a tip bearing similar to those you find in H0 model trains. These are working great and have almost no friction. The concept worked very well, but the servos are too cheap ones. They are jittering all the time without reason and had far too much backlash.
Hint: To point a screw, clamp the screw in a drilling machine or lathe and use a dremel/proxxon tool to grind it pointy.
Next step was to buy new servos from a local toy store. As they had no similar sized, I got two SAVÖX SH-0255 (digital). The servos itself are much more rigid than the nano ones and so I tried to make a gimbal without counter bearing -> bad idea! The vibrations were very well visible. I also started to use support structures on my 3D printer. I had to play around, but for the first time with success. My advice is to let one layer empty on top and bottom of the support. Otherwise it will be almost impossible to separate it from the part.
So back to the first gimbal concept. I redesigned all the parts for the new servos and counter bearings. The results are amazing compared to the first cam support. The servos still jitter, I think the KK2 is not the best choice to control a gimbal very smooth. Of course the best (but also much more expensive) option would have been separate controller board with brushless gimbal motors.