About this 3D model

I'm trying to make a mind controlled tentacle and this is where I'm at so far. Right now, the ball and socket joints are a little too loose, and the movement isn't very good (partly due to the weight of the parts). Also the sockets are a little stiff and fragile when printed with PLA Once all that is sorted, I'll hook it up to some servos and the obligatory Arduino. Video of it "working": http://youtu.be/EVMatHNgC6s