Replacement head for Ultimaker to allow the use of the E3D hotend. This allows jam free printing at elevated temperatures for PLA, ABS and PC. It can also go phenominally fast. ABS at >150mm/s is no problem, as you can run it at 265deg. This also gives very strong parts with superb surface finish. It has mounting points that replicate the lower Ultimaker plate, so as you can attach your favorite cooling fan. The E3D head is held in with a single screw and captive nut. YouTube link of my first version printing here http://youtu.be/5YNZmCaw0O4. Apologies for the poor camera work! With thanks to Sanjay at E3D for his support! Please see the fanduct optimised for this head http://www.thingiverse.com/thing:131647 Print both parts top and bottom in ABS, no supports needed, and stick them together with acetone or superglue or print the whole thing at once with supports if you prefer. If (like me) your printer can't do ABS with the V2 hotend, then make one in PLA, and it will last long enough to make one in ABS that should last. Depending on how well calibrated your Ultimaker is, you may need to clean out the 12mm diameter holes for the linear bearings with a reamer, or it actually works quite well just to paint them with acetone to soften the inner surface before you push the bearings in. The ABS then sets around the bearings. All parts are assembled with M3 screws. The Ultimaker thermocouple board screws directly on top. The wires from the fan, heater and thermocouple go up the tube on the head to keep them neat. This works well in a heated chamber up to about 45degC, above that the cold end of the head can't be kept cold enough. This is normally warm enough to stop ABS from warping though, so shouldn't be a problem. You will need to adjust your endstop switches slightly, the size of the head means you lose about 2mm of X and Y area. Z height is the same as the V2 ultimkaker head. Any questions just message me or post on here.