With the E3D Revo CR upgrade kit you'll be able to change the nozzle without tools. The improved heatsink also ensures that printing can be done with a maximum temperature of 300°C. The set includes a 24V Revo CR hotend with an interchangeable 0.4mm nozzle.
The E3D Revo nozzle has its own heatbreak. This means that it is not necessary to tighten the nozzle at a high temperature. Because each Revo nozzle diameter has its own colour, you can quickly see which nozzle diameter you have in the hotend.