This recent addition to my robot collection - the Omnibot 2000 - is just coming out of the ICU ward of the Robot Wing due to a broken arm. From my experience with these fantastic robots, this is a common malady. The problem occurs when the right shoulder joint breaks loose from the arm. I have successfully reproduced the shoulder joint by making a mold from the original and casting a new piece out of two-part plastic resin. The part is not quite ready for primetime yet - there are a few voids around the perimeter that I need to stop from forming. If I am successful in my mad experiments, I hope to be able to offer this high failure part for sale soon!
! UPDATE !
Well, I never was able to get the molded joint to come out properly, but... the very first object I modeled with my new, first ever, 3D printer was a replacement joint. For the time being, I am offering the model file for this piece for free if want to print one yourself. You can download the STL file for it from my Thingiverse account here. So long as this remains free, I will happily leave it up. If I find anyone selling it, I will pull the files. If you do not have a 3D printer, I will be happy to print one for you. Just shoot me an email.
Year Released: 1984
Dimensions: 24" tall x 15" wide
Just in case you wanted to see Omnibot 2000 awaiting surgery...