Where I'm at so far..... I have figured out the theory behind the X axis drive. The mods to the stepper motors is a given but not unrealistic. What is bugging me is the quality of the output. Looking at the Geoweaver's mess, I'm hoping for a proper model. Whilst on the subject of the Geoweaver, the distance between the extrusion and the layer is enormous, allowing for cooling and virtually no bonding. It really is an experiment! I'm looking for a proper model as an output. This then brings me on to warping. This is something that occurs often in models and is primarily to do with the heating and cooling between layers. Compensaters such as heated beds and fans seem to work as does printing with PLA rather than ABS, due to the material property. So when I am printing in the unlimited X axis, I will find that I will start to warp longitudinally rather than vertically. It is possible that this could be overcome by operating a heated fan in front of the hotend (this would mean having four fans for heating plus the cooling one!) but the truth lays firmly in the overall temperature gradient throughout the model. I've read about people putting their printers inside of fridges to print, also people putting their printers inside sealable bags to keep the heat in depending on what it is they are doing. I can not do this if I am to print on the floor! So now I'm not sure whether this is a departure from my project or not. The fact that I have produced a theory that, to all campers and dolphins (intents and purposes), will move the datum outside of the machine envelope just has to be built to be proved. Is this worthy of an MSc? Or do I build it AND have it make a decent model? Time to fire up my handlers!