3D printed version of the simpliest robot; the one that use a motor, tape and a plastic pot...
You can see a video: http://www.buildreprap.com/ca/robots/catala-artisbot/?lang=es

Please use last improved version artisbot09.stl !
You can print the pieces with infill of 20% or 30% but the one used as a weight attached to the motor axis should be heavy, then use 40% .
Insert the motor in the center hole, introduce the motor cables trough the dome piece. Join the AA battery and use aluminium foil on the cables to connect both sides to the cables.