This all metal hotend is developped for the “new CraftBot Plus” (as produced from October 2019)., but will fit your early CraftBot with FCC cable as well.
It takes only nozzles as made by CraftUnique. Nozzles with a long 0.75mm thread (So the Volcano of E3d will NOT fit).. See here for the CraftUnique nozzle set with different nozzle sizes.
Benefits of the upgraded nozzle and hotend:
The longer nozzle thread helps more efficient filament heating
The new heatbreak prevent the melted plastic to go up to the cool area and clog there
The new cover on the heatblock helps to keep the nozzle temperature more stable (ex, when the object fan starts the temperature will not drop)
To assemble the nozzle, it is not necessary to heat the heatblock and heatbreak.