Olsson Block Kit is a community developed add-on to the Ultimaker 2 and Ultimaker 2 Extended. It is a heater block replacement with different sized nozzles for quick nozzle swap out.
Each kit contains a heater block, installation tools and 4 different sized nozzles: 0.25mm, 0.4mm, 0.6mm and 0.8mm.
Use with Ultimaker 2 and Ultimaker 2 Extended 3D printers.
Olsson Block Installation Guide