Changed base for the Lite Arm i2 & S3 robot adapter

This is a changed base for the Lite Arm i2. The original thing is the "Open Source Robotic Arm (Lite Arm i2) " http://www.thingiverse.com/thing:480446
The external appearance of the arm is the same. However I made the base stronger and simpler (two parts less)

I changed some parts from the base of the Arm and I replaced some others with one part. I also replace the bearing with another stronger.
More specifically :
1) I changed the original part 1B.stl to the 1B_NEW.stl
2) I changed