It is a simple robot arm build by me for my final project at
highschool. It's built out of aluminum square frames and is
powered by 3 steppermotors and 1 dc motor for the end effector. It's sorta slow but I can live with that. I desined it without any help and without any books either. It cost me about $250 all together. On the picture is you can see the interface as well which I also build. It's drivven by the parallel port of my PC. It can pick things up with it's gripper etc.