A plate to put on the X-carriage of the wallace and under the extruder to have possibility to put a makergear hotend with 36mm barrel, or a jhead. Because The X-carriage is too high to put this without that. It also have a 40mm fan mount to keep carriage and extuder cool.Print, remove the little supports, put under (inside) the extruder (extruder have to be printed with jhead parameter). Put your hotend in it, screw everything, add a 40mm fan, screw it, enjoy.