I also had to return my almost completely built unit as it was missing one bag of parts namely the extruder drive set. This was very frustrating as our local RS Components (South Africa) was not able to provide the only parts that were missing - I had to order an entire kit and return the one I had. My kit was number 71 of the 500 initial kits available so if their is an extra extruder drive setby SuperDerek - Ormerod