2 things. First, does anyone know the name of the curved black panel part used in this construction? I'm having a hard time locating one and need to look through some of the on line sellers but cannot narrow my search.
Second, to get your robot arm to set up the same way every time, make sure the gear with knobs on the robot itself is in the same place and then hold the robot arm on the attachment in the same place when you drop the frame on the robot. Otherwise the other reply is correct, there is no calibration per se, the motors just turn whichever direction you tell it to from the point where it is when you issue the command.