The 2.0 version is a high performance hotend for use with RepRap and other 3D printers,making your printing even faster. The hot end comes completely assembled: wire it to your electronics and it is ready to print. It now includes an aluminum mount plate and aluminum heat sinks. The 2.0 also brings changes to the nozzle, heater block, and threaded extension with harder aluminum and revised thread profile for more reliable nozzle changes. Optional nozzle sizes are available from 0.25mm to 0.75mm. With the optional PTFE tube, you can print 3mm filament. The hotend comes assembled with both 0.35mm and 0.4mm nozzle. Otherwise, if you would like a different nozzle size you will need to purchase an extra nozzle and make the change once you receive both parts. Features: 1. Aluminum Block Resistor Hotend Easily assembled and torn down with no glue or ceramic 2. Wire Strain Relief 3. Includes machined aluminum and steel parts, and laser cut wooden parts 4. Includes pre-crimped wiringPackage List Package List 1 x hot end 2.0 version 1 x 0.35mm nozzle 1 x 0.4mm nozzle.