This is the Ultimaker 2 integrated nozzle + heater block for 3mm filament. This part is also included in the Ultimaker 2 hot end bundle. It has a 0.4mm diameter. It is ONLY compatible with the Ultimaker 2.
Upgraded parts. Development has worked hard and is proud to introduce you the new extruder drive mechanism. It’s a derivative of the design of Bertho’s on Thingiverse. It has quite a few benefits over the old one.