This X carriage adapter will allow you to use the E3D bowden extruder. The hole spacing for the modules has been kept the same so that you can use any modules designed for the original: • Prusa i3 X Carriage Adapter for Bulldog XL Extruder (http://www.thingiverse.com/thing:458308) So far this includes the fan duct and both of the Z probe designs. Requirements • 1x small cable tie, • M3 screws - amount and length depends on modules used. Refer to the original adapter linked above.